pre-

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 ).
Also, prae-.


Origin:
< Latin prae-, prefixal use of prae (preposition and adv.); akin to first, fore, prior, pro1

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P.R.E.

Petroleum Refining Engineer.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Pre is always a great word to know.
So is quincunx. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
pre-
 
prefix
before in time, rank, order, position, etc: predate; pre-eminent; premeditation; prefrontal; preschool
 
[from Latin prae-, from prae before, beforehand, in front]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

pre-
prefix meaning "before," from O.Fr. pre- and M.L. pre-, both from L. præ (adv.) "before," from PIE *prai- (cf. Oscan prai, Umbrian pre, Skt. pare "thereupon," Gk. parai "at," Gaul. are- "at, before," Lith. pre "at," O.C.S. pri "at," Goth. faura, O.E. fore "before"), variant of base per- "beyond."
The L. word was active in forming compound verbs.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pre- pref.

  1. Earlier; before; prior to: prenatal.

  2. Anterior; in front of: preaxial.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
PRE
progressive resistive exercise
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Kittens will be delivered via private jet courier to pre-selected veterinary
  offices where owners can pick them up.
In the car boots will be laptop computers, cash-counting machines and
  pre-printed signs that can be stuck on the windows.
They supply a collection kit that comes with nine vials pre-loaded with cookie
  crumbs.
It guides them through the pre-grad school process including grad-level writing
  and preparation skills.
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