~ 1
■ prefix
1》 favouring; supporting: ~choice.
2》 acting as a substitute for: proconsul.
3》 denoting motion forwards, out, or away: propel.
Origin
from L. pro 'in front of, on behalf of, instead of, on account of'.
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~ 2
■ prefix before in time, place, or order: proactive.
Origin
from Gk pro 'before'.