all-time

[awl-tahym]
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.

Origin:
1910–15

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
all-time
 
adj
informal (prenominal) unsurpassed in some respect at a particular time: an all-time record at the Olympics

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Prices for food commodities are at all-time highs, prompting the firm to
  increase prices twice in the past year.
These woes, and more, are frequently sung in chorus for this all-time favorite
  dessert.
Public anxiety over college costs is at an all-time high.
Its stock has fallen ninety per cent from its all-time high.
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