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English definition of “first name”

first name

noun [C]    
A2 the name that was given to you when you were born and that comes before your family name: It can be rude to call someone by their first name if they are much older or more important than you.Names and titles on first-name terms UK (US on a first-name basis) friendly or familiar enough with someone to call them by their first nameFriendly
(Definition of first name noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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