Pro

·adj A Latin preposition signifying for, before, forth.

II. Pro ·adv For, on, or in behalf of, the affirmative side;

— in contrast with con.

pro
prō (archaic collat. form, posi in posimerium; cf. pono, from posino; cf. Gr. ποτί and ποτ with πρ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
pro
prō (1) adv., see prout. ...

An Elementary Latin Dictionary
Pro-
·- A prefix signifying before, in front, forth, for, in behalf of, in place of, according to; as, pr...

Webster's Dictionary of the English Language
Pro rata
·- In proportion; proportionately; according to the share, interest, or liability of each. ...

Webster's Dictionary of the English Language
Pro thyalosoma
·noun The investing portion, or spherical envelope, surrounding the eccentric germinal spot of the g...

Webster's Dictionary of the English Language
pro-slavery
In favor of slavery. An expression much used by political speakers and writers, although not yet ins...

Dictionary of American Words And Phrases by John Russell Bartlett.