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

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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 for alltime
The rate of description of new catfishes is at an alltime high.
The alltime record lowest temperature was , but there is an unofficial record of .
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