The Collaborative International Dictionary of English v.0.48:
Wit \Wit\ (w[i^]t), v. t. & i. [inf. (To) Wit; pres. sing.
Wot; pl. Wite; imp. Wist(e); p. p. Wist; p. pr. & vb.
n. Wit(t)ing. See the Note below.] [OE. witen, pres. ich
wot, wat, I know (wot), imp. wiste, AS. witan, pres. w[=a]t,
imp. wiste, wisse; akin to OFries. wita, OS. witan, D. weten,
G. wissen, OHG. wizzan, Icel. vita, Sw. veta, Dan. vide,
Goth. witan to observe, wait I know, Russ. vidiete to see, L.
videre, Gr. ?, Skr. vid to know, learn; cf. Skr. vid to find.
????. Cf. History, Idea, Idol, -oid, Twit, Veda,
Vision, Wise, a. & n., Wot.]
To know; to learn. "I wot and wist alway." --Chaucer.
Note: The present tense was inflected as follows; sing. 1st
pers. wot; 2d pers. wost, or wot(t)est; 3d pers. wot,
or wot(t)eth; pl. witen, or wite. The following variant
forms also occur; pres. sing. 1st & 3d pers. wat, woot;
pres. pl. wyten, or wyte, weete, wote, wot; imp. wuste
(Southern dialect); p. pr. wotting. Later, other
variant or corrupt forms are found, as, in Shakespeare,
3d pers. sing. pres. wots.
Brethren, we do you to wit [make you to know] of
the grace of God bestowed on the churches of
Macedonia. --2 Cor. viii.
Thou wost full little what thou meanest.
We witen not what thing we prayen here.
When that the sooth in wist. --Chaucer.
Note: This verb is now used only in the infinitive, to wit,
which is employed, especially in legal language, to
call attention to a particular thing, or to a more
particular specification of what has preceded, and is
equivalent to namely, that is to say.