Definition of pro- in English:

pro-1

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'.

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Word of the day middlescent
Pronunciation: ˌmidlˈesənt
adjective
middle-aged, but still maintaining youthful interests and activities