- The definition of appertain is to belong as a function or to relate to something.
An example of something that appertains to members of the military is a distinction of honor.
appertain definition by Webster's New World
Origin: Middle English apertenen ; from Old French apertenir ; from Late Latin appertinere ; from ad-, to plush pertinere: see pertain
appertain definition by American Heritage Dictionary
intransitive verb ap·per·tained, ap·per·tain·ing, ap·per·tains
Origin: Middle English appertenen, from Old French apartenir, from Vulgar Latin *appartenēre, from Late Latin appertinēre : ad-, ad- + pertinēre, to belong; see pertain.