You know what it looks like… but what is it called?
TAKE THE QUIZ“a first”
The following 2 entries include the term a first.
on a first-come, first-served basis
idiom: in the order of arrival of people or requests
on a first-name basis
idiom: having a close personal relationship where each person addresses the other by their first name —sometimes used figuratively to describe something that one is familiar with or accustomed to
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Merriam-Webster unabridged