Webster's Revised Unabridged Dictionary · 1913

It

It (it) , pronoun

[Old English it, hit, Anglo-Saxon hit; compare Dutch het. r181. See He.]

The neuter pronoun of the third person, corresponding to the masculine pronoun he and the feminine she, and having the same plural (they, their or theirs, them).
The day present hath ever inough to do with it owne grief. — Genevan Test
Do, child, go to it grandam, child. — Shakespeare
It knighthood shall do worse. It shall fright all it friends with borrowing letters. — B. Jonson
The fruit tree yielding fruit after his (its) kind. — Gen. i. 11

The possessive form its is modern, being rarely found in the writings of Shakespeare and Milton, and not at all in the original King James's version of the Bible. During the transition from the regular his to the anomalous its, it was to some extent employed in the possessive without the case ending. See His, and He. In Dryden's time its had become quite established as the regular form.

In the course of time, the nature of the neuter sign t in it, the form being found in but a few words, became misunderstood. Instead of being looked upon as an affix, it passed for part of the original word. Hence was formed from it the anomalous genitive its, superseding the Saxon his.

1.
As a substance for any noun of the neuter gender; as, here is the book, take it home.
2.
As a demonstrative, especially at the beginning of a sentence, pointing to that which is about to be stated, named, or mentioned, or referring to that which apparent or well known; as, I saw it was John.
It is I; be not afraid. — Matt. xiv. 27
Peter heard that it was the Lord. — John xxi. 7
3.
As an indefinite nominative for a impersonal verb; as, it snows; it rains.
4.
As a substitute for such general terms as, the state of affairs, the condition of things, and the like; as, how is it with the sick man?
Think on me when it shall be well with thee. — Gen. xl. 14
5.
As an indefinite object after some intransitive verbs, or after a substantive used humorously as a verb; as, to foot it (i. e., to walk).
The Lacedemonians, at the Straits of Thermopyla, when their arms failed them, fought it out with nails and teeth. — Dryden
Whether the charmer sinner it, or saint it, If folly grows romantic, I must paint it. — Pope
Collocations (1)
Its self , See Itself.