I. ˈmī, mə adjective
Etymology: Middle English, from Old English mīn, from mīn, suppletive genitive of ic I; akin to Old English mē me
Date: 12th century
1. : of or relating to me or myself especially as possessor, agent, object of an action, or familiar person
my car
my injuries
my man
2. — used interjectionally to express surprise and sometimes reduplicated
my oh my
— used also interjectionally with names of various parts of the body to express doubt or disapproval
my foot
II. abbreviation
million years