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out-

  1. a prefixal use of out, adv., occurring in various senses in compounds (outcast, outcome, outside), and serving also to form many transitive verbs denoting a going beyond, surpassing, or outdoing in the particular action indicated (outbid, outdo, outgeneral, outlast, outstay, outrate).
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Origin of out-

Middle English; Old English ūt-; see out
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for out-

out-

prefix
  1. excelling or surpassing in a particular actionoutlast; outlive
  2. indicating an external location or situation away from the centreoutpost; outpatient
  3. indicating emergence, an issuing forth, etcoutcrop; outgrowth
  4. indicating the result of an actionoutcome
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012