minor

of lesser importance or stature or rank

“a minor poet”

“had a minor part in the play”

“a minor official”

“many of these hardy adventurers were minor noblemen”

lesser in scope or effect

“had minor differences”

“a minor disturbance”

inferior in number or size or amount

“a minor share of the profits”

“Ursa Minor”

(of a scale or mode) having half steps between the second and third degrees, and (usually) the fifth and sixth degrees, and the seventh and eighth degrees

“the minor keys”

“in B flat minor”

not of legal age

“minor children”

of lesser seriousness or danger

“suffered only minor injuries”

“some minor flooding”

“a minor tropical disturbance”

a young person of either sex

“she writes books for children”

“they're just kids”

“‘tiddler’ is a British term for youngster”

have as one's secondary field of study

“in college she minored in mathematics”