Definition of boy
1a(1) : a male child from birth to adulthood a ten-year-old boy
(2) : a child whose gender identity is male Author Kyle Lukoff told Newsweek, Call Me Max and other books in the series are about a young trans boy figuring out who he is, making new friends, and sharing about himself with his family and community.— Samantha Lock
b : son Even though it made them uncomfortable to have their boy talked about all over town, secretly, Nick's mom and dad were pleased.— Andrew Clements
c : an immature male separate the men from the boys a boy genius
2a : a man or boy native to a given place a local boy
c —used interjectionally to express intensity of feeling Boy, what a game!
3 chiefly US slang : a close male friend Now, the receiver is getting a second chance, thanks to old friend Tom Brady. "Tom is my boy," [Antonio] Brown said Wednesday during his introductory video press conference in Tampa.— Michael Hurley
4 : a male domesticated animal and especially a pet Leo is a 2-year-old pit bull mix. … He loves receiving attention, getting pets and being told he is a good boy. — The Denver Post Jean Greening greets the birds in the aviary with whistles, kissing noises, and the phrase, "Who's a pretty boy?" — Current Science
5a dated, offensive : a male servant or an enslaved man
b disparaging + offensive —used to address a man of color and especially a Black man
Note: The deeply offensive use of the word boy to address an adult man of color has a strong association with sense 5a and is a term expressive of racist condescension.
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