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Meaning of pre-

pre-

Pronunciation: [key]
  1. a prefix occurring originally in loanwords from Latin, where it meant “before” (preclude; prevent); applied freely as a prefix, with the meanings “prior to,” “in advance of,” “early,” “beforehand,” “before,” “in front of,” and with other figurative meanings (preschool; prewar; prepay: preoral; prefrontal).

P.R.E.

Pronunciation: [key]
  1. Petroleum Refining Engineer.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.