an act or instance of looking something up, as information in a reference book or an on-line database.
Also, look-up.

1945–50 for an earlier sense; noun use of verb phrase look up

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The app makes you enter the number of hours of sunlight manually-no automatic lookup.
Lookup incoherent and that should provide the explanation you want.
It also triggers the market price lookup software that gathers prices from websites around the globe.
Additional content for the navigation category of lookup.
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