Definition of pro- in English:

pro-

Syllabification: pro-

prefix

1Favoring; supporting: pro-choice pro-life
2Acting as a substitute or deputy for; on behalf of; for: proconsul procure
3Denoting motion forward, out, or away: proceed propel prostrate

Origin

from Latin pro 'in front of, on behalf of, instead of, on account of'.

Definition of pro- in:

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Word of the day humoresque
Pronunciation: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music