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all-time

[awl-tahym]
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adjective
  1. never surpassed or greater: Production will reach an all-time high.
  2. regarded as such in its entire history: an all-time favorite song.
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Origin of all-time

First recorded in 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for all-time

all-time

adjective
  1. (prenominal) informal unsurpassed in some respect at a particular timean all-time record at the Olympics
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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

Word Origin and History for all-time

adj.

"during recorded time," 1910, American English, from all + time (n.). Earlier it had been used in a sense "full-time," of employment, or in opposition to one-time (1883).

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Online Etymology Dictionary, © 2010 Douglas Harper