First I would like to show the Stron’gs Greek Lexicon definition for the term “sin”, as it is found in the New Testament

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As you know, in Christ there is no sin nor darkness (Jn 8:46, 2Cor 5:21, Heb 4:15, 1Ptr 2:22, 1Jn 3:5, 1Jn 1:5). We (those who are born again [born of the Spirit of God]) are in Christ and He is in us (Jn 14:20, 1Cor 1:30, Gal 3:28, Eph 2:6, 1Ptr 5:14; 1Cor 3:16, 2Cor 13:5, Col 1:27). This is the relationship that we have been brought into: "the fellowship of the Father and the Son" – the Crucified Life (1Jn 1:3, Jn 10:38, Jn 14:10-11, Jn 14:20, Jn 17:21, Gal 2:20). We are to be actively participating in this relationship. The same way that Jesus was an expression (manifestation) of the Father when He walked on this earth, we (those who are born again) are to be an expression (manifestation) of Christ (Heb 1:3, Col 1:15, Jn 12:44-45, Jn 14:7-11, 2Cor 4:10-12, Gal 2:20). This is, of course dependent upon the Son being revealed in us (Gal 1:11-12, Gal 1:15-16) by the work of the Holy Spirit.

The degree that Christ is revealed in us will determine the degree that we comprehend that "I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me" (Gal 2:20). This will always result in Him having His expression (manifestation) though us, thus we are "alive unto God through Jesus Christ" (Rom 6:11). Christ of course, does not sin, but always does those things that please the Father (Jn 8:46, 2Cor 5:21, Heb 4:15, 1Ptr 2:22, Jn 8:29). By Him having His expression (manifestation) through us, there is no room for sin.

When Christ is revealed in us, we see that "I" (the one who sins) am crucified, dead and buried. When Christ died, I died in Him. When Christ was buried, I was buried in Him. When Christ was raised, I was raised in Him by His Life - "I" remained buried in the grave, now Christ lives in me (Rom 6:1-11, Eph 2:6, Gal 2:20). As we continue in the revealing of the Son, then this reality that it is "Christ who lives in me" is made more and more apparent in our daily walk.

If Christ is not revealed in us, then it is still "I" in our understanding and we will, without fail, "sin". So long as it is "I", I will sin. Christ must be revealed in us. We must continue in the revealing of the Son and walk in His revealing. Not for the purpose that we would "no longer sin", because "sin" is ultimately not the issue - Christ is the issue. Christ must be revealed in us. We must continue in the revealing of the Son so that it would be "not I, but Christ" in all things that we do, or do not do. If our goal is "not to sin", then we are no longer "looking unto Jesus". But the writer of the book of Hebrews exhorts us in chapter 12 verse 1 through 2:

"Wherefore seeing we also are compassed about with so great a cloud of witnesses, let us lay aside every weight, and the sin which doth so easily beset us, and let us run with patience the race that is set before us, Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God."

(Heb 12:1-2, emphasis added).

Now as concerning the term "sin" in the New Testament, the majority of the times that it is mentioned, it is Strong’s number <266>, which is from Strong’s number <264>. It is this latter definition that I would like for us to consider. It is the Greek word amartanw hamartano ham-ar-tan'-o and means "properly, to miss the mark (and so not share in the prize)". What then is the Prize? Is the Prize not sinning? No, the Prize is Christ Himself. And the result of winning the Prize is that He and He alone is having His expression in and through us.

So then, the goal is not sinless perfection as is clearly seen in the scripture and the original Greek term. The goal is to know Him, [to lay hold of Him and manifest this relationship – The Crucified Life, even as Jesus lived the Crucified Life and manifested the Life of the Father], in whatever time frame/season we are found in is still the Goal. To miss out on this, is to miss out on our purpose for which we were created. The Lord keep us in "The High Calling of God" by His Holy Spirit (Phil 3:4-16).

References:

Jn 8:46

Which of you convinceth me of sin? And if I say the truth, why do ye not believe me?

2Cor 5:21

For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him.

Heb 4:15

For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as [we are, yet] without sin.

1Ptr 2:22

Who did no sin, neither was guile found in his mouth:

1Jn 3:5

And ye know that he was manifested to take away our sins; and in him is no sin.

1Jn 1:5

This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.

Jn 14:20

At that day ye shall know that I [am] in my Father, and ye in me, and I in you.

1Cor 1:30

But of him are ye in Christ Jesus, who of God is made unto us wisdom, and righteousness, and sanctification, and redemption:

Gal 3:28

There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus.

Eph 2:6

And hath raised [us] up together, and made [us] sit together in heavenly [places] in Christ Jesus:

1Ptr 5:14

Greet ye one another with a kiss of charity. Peace [be] with you all that are in Christ Jesus. Amen.

1Cor 3:16

Know ye not that ye are the temple of God, and [that] the Spirit of God dwelleth in you?

2Cor 13:5

Examine yourselves, whether ye be in the faith; prove your own selves. Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates?

Col 1:27

To whom God would make known what [is] the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory:

1Jn 1:3

That which we have seen and heard declare we unto you, that ye also may have fellowship with us: and truly our fellowship [is] with the Father, and with his Son Jesus Christ.

Jn 10:38

But if I do, though ye believe not me, believe the works: that ye may know, and believe, that the Father [is] in me, and I in him.

Jn 14:10-11

Believest thou not that I am in the Father, and the Father in me? the words that I speak unto you I speak not of myself: but the Father that dwelleth in me, he doeth the works. Believe me that I [am] in the Father, and the Father in me: or else believe me for the very works’ sake.

Jn 14:20

At that day ye shall know that I [am] in my Father, and ye in me, and I in you.

Jn 17:21

That they all may be one; as thou, Father, [art] in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me.

Gal 2:20

I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.

Heb 1:3

Who [the Son] being the brightness of [his] glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high;

Col 1:15

Who is the image of the invisible God, the firstborn of every creature:

Jn 12:44-45

Jesus cried and said, He that believeth on me, believeth not on me, but on him that sent me. And he that seeth me seeth him that sent me.

Jn 14:7-11

If ye had known me, ye should have known my Father also: and from henceforth ye know him, and have seen him. Philip saith unto him, Lord, shew us the Father, and it sufficeth us. Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou [then], Shew us the Father? Believest thou not that I am in the Father, and the Father in me? the words that I speak unto you I speak not of myself: but the Father that dwelleth in me, he doeth the works. Believe me that I [am] in the Father, and the Father in me: or else believe me for the very works’ sake.

2Cor 4:10-12

Always bearing about in the body the dying of the Lord Jesus, that the life also of Jesus might be made manifest in our body. For we which live are alway delivered unto death for Jesus’ sake, that the life also of Jesus might be made manifest in our mortal flesh. So then death worketh in us, but life in you.

Gal 2:20

Gal 1:11-12

But I certify you, brethren, that the gospel which was preached of me is not after man. For I neither received it of man, neither was I taught [it], but by the revelation of Jesus Christ.

Gal 1:15-16

But when it pleased God, who separated me from my mother’s womb, and called [me] by his grace, To reveal his Son in me, that I might preach him among the heathen; immediately I conferred not with flesh and blood:

Rom 6:11

Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.

Jn 8:46

Which of you convinceth me of sin? And if I say the truth, why do ye not believe me?

2Cor 5:21

For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him.

Heb 4:15

For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as [we are, yet] without sin.

1Ptr 2:22

Who did no sin, neither was guile found in his mouth:

Jn 8:29

And he that sent me is with me: the Father hath not left me alone; for I do always those things that please him.

Rom 6:1-11

What shall we say then? Shall we continue in sin, that grace may abound? God forbid. How shall we, that are dead to sin, live any longer therein? Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death? Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life. For if we have been planted together in the likeness of his death, we shall be also [in the likeness] of [his] resurrection: Knowing this, that our old man is crucified with [him], that the body of sin might be destroyed, that henceforth we should not serve sin. For he that is dead is freed from sin. Now if we be dead with Christ, we believe that we shall also live with him: Knowing that Christ being raised from the dead dieth no more; death hath no more dominion over him. For in that he died, he died unto sin once: but in that he liveth, he liveth unto God. Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.

Eph 2:6

And hath raised [us] up together, and made [us] sit together in heavenly [places] in Christ Jesus:

Gal 2:20

Stong’s Greek Lexicon: "sin" <266>

266. amartia hamartia ham-ar-tee'-ah; from 264; a sin (properly abstract):-- offence, sin(-ful).

Stong’s Greek Lexicon: "sin" <264>

264. amartanw hamartano ham-ar-tan'-o; perhaps from 1 (as a negative particle) and the base of 3313; properly, to miss the mark (and so not share in the prize), i.e. (figuratively) to err, especially (morally) to sin:-- for your faults, offend, sin, trespass.

Phil 3:4-16

Though I might also have confidence in the flesh. If any other man thinketh that he hath whereof he might trust in the flesh, I more: Circumcised the eighth day, of the stock of Israel, [of] the tribe of Benjamin, an Hebrew of the Hebrews; as touching the law, a Pharisee; Concerning zeal, persecuting the church; touching the righteousness which is in the law, blameless. But what things were gain to me, those I counted loss for Christ. Yea doubtless, and I count all things [but] loss for the excellency of the knowledge of Christ Jesus my Lord: for whom I have suffered the loss of all things, and do count them [but] dung, that I may win Christ, And be found in him, not having mine own righteousness, which is of the law, but that which is through the faith of Christ, the righteousness which is of God by faith: That I may know him, and the power of his resurrection, and the fellowship of his sufferings, being made conformable unto his death; If by any means I might attain unto the resurrection of the dead. Not as though I had already attained, either were already perfect: but I follow after, if that I may apprehend that for which also I am apprehended of Christ Jesus. Brethren, I count not myself to have apprehended: but [this] one thing [I do], forgetting those things which are behind, and reaching forth unto those things which are before, I press toward the mark for the prize of the high calling of God in Christ Jesus. Let us therefore, as many as be perfect, be thus minded: and if in any thing ye be otherwise minded, God shall reveal even this unto you. Nevertheless, whereto we have already attained, let us walk by the same rule, let us mind the same thing.