IPA: /ˈlʊkʌp/
KK: /ˈlʊkʌp/
The act of searching for and finding information, often in a database or reference source.
I did a quick lookup of the word in the dictionary to understand its meaning.
Lookup → It is formed from "look" (from Old English *locian*, meaning to see or observe) and "up" (meaning in a higher position or direction). The word "lookup" means to search for information or to observe something in a higher position.
Think of 'looking' ('locian') for something 'up' — that's why 'lookup' means to search for information.