Con- \Con-\ A prefix, fr. L. cum, signifying with, together, etc. See Com-.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Con \Con\, adv. [Abbrev. from L. contra against.]

Against the affirmative side; in opposition; on the negative side; -- The antithesis of pro, and usually in connection with it. See Pro.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Con \Con\, v. t. [imp. & p. p. Conned; p. pr. & vb. n. Conning.]

[AS. cunnan to know, be able, and (derived from this) cunnian to try, test. See Can, v. t. & i.]

1. To know; to understand; to acknowledge. [Obs.]

Of muses, Hobbinol, I con no skill. --Spenser.

They say they con to heaven the highway. --Spenser.

2. To study in order to know; to peruse; to learn; to commit to memory; to regard studiously.

Fixedly did look Upon the muddy waters which he conned As if he had been reading in a book. --Wordsworth.

I did not come into Parliament to con my lesson. --Burke.

To con answer, to be able to answer. [Obs.]

To con thanks, to thank; to acknowledge obligation. [Obs.]

--Shak.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Con \Con\, v. t. [See Cond.]

(Naut.) To conduct, or superintend the steering of (a vessel); to watch the course of (a vessel) and direct the helmsman how to steer.

Source: Webster's Revised Unabridged Dictionary (1913)