Sin

“Sin” From Dictionary of Biblical Words:

The evil principle (called also the flesh, the old man), which was acquired at the fall. It is defined as lawlessness (1 John 3:4,4Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law. (1 John 3:4) R.V.); in fact, the two words are interchangeable. The essential principle of sin consists in a dependent being like man casting off his allegiance to God, and acting in independence, according to his own will apart from Divine rule. The death of Christ was to put away sin from before God (Heb. 9:2626For then must he often have suffered since the foundation of the world: but now once in the end of the world hath he appeared to put away sin by the sacrifice of himself. (Hebrews 9:26)); eventually when Christ reigns, the principle will tease to be active anywhere on earth although it will exist in the hearts of unregenerate men, as will be seen at the close (Rev. 20:88And shall go out to deceive the nations which are in the four quarters of the earth, Gog and Magog, to gather them together to battle: the number of whom is as the sand of the sea. (Revelation 20:8)). In the new heaven and earth there will be no sin. This principle ever remains in the believer (1 John 1:88If we say that we have no sin, we deceive ourselves, and the truth is not in us. (1 John 1:8)), although he is responsible to keep it inactive. Those that think the root is gene deceive themselves.

“Sins” From Dictionary of Biblical Words:

The fruit of sin, the root. These are all forgiven tor Christ’s sake to those that believe in Him (1 John 2:1212I write unto you, little children, because your sins are forgiven you for his name's sake. (1 John 2:12)). All have sinned, and it is because of this, and not because they have sin that they are judged. I cannot change what I am, but I am responsible not to let my evil self act. No believer need sin. He cannot eradicate the root, but he may and ought to keep it in death that it may produce no fruit (sins), and never yield any of his members to sin (Rom. 6). For I ordinarily commit sin through the medium of my body.

Boyd’s Bible Dictionary:

Concise Bible Dictionary:

Strong’s Dictionary of Hebrew Words:

Number:
5512 (find all occurrences in KJV Bible)
Transliteration:
Ciyn
Phonic:
seen
Meaning:
of uncertain derivation; Sin the name of an Egyptian town and (probably) desert adjoining
KJV Usage:
Sin

Potts’ Bible Proper Names:

Clay; mud:―name of an Egyptian town and of a desert place, Ezek. 30:15. {Lutum}

From Anstey’s Doctrinal Definitions:

As a rule in the New Testament epistles, “sins” (plural) refer to the evil deeds that men do, and “sin” (singular) is the fallen nature in men (the flesh). Hence, “sins” are evil actions, whereas “sin” is the evil nature. The first is what we have done, and the second is what we are. Thus, “sins” are manifestations of “sin;” or “sins” are the product of “sin;” or “sins” are the fruit of a bad tree and “sin” is the root of that bad tree. “Sin” is more than just the old sin-nature; it is that evil nature with a will in it that is determined to gratify its lusts.
Another difference between these two things is that “sins” can be “forgiven” by the grace of God (Rom. 4:77Saying, Blessed are they whose iniquities are forgiven, and whose sins are covered. (Romans 4:7)), but “sin” is not forgiven, but rather, it is “condemned” under the righteous judgment of God (Rom. 8:33For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh: (Romans 8:3)). It is important to pay attention to this distinction when reading the epistles; if we don’t, we will come away with some mistaken ideas.