Definition of "First" :

noun: the fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate)

noun: the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving

noun: an honours degree of the highest class

noun: the first element in a countable series

"The first of the month."

noun: the first or highest in an ordering or series

"He wanted to be the first."

noun: the time at which something is supposed to begin

adjective: ranking above all others

"Was first in her class."

adjective: serving to begin

"The first verse."

adjective: serving to set in motion

"His first (or maiden) speech in Congress."

adjective: preceding all others in time or space or degree

"The first house on the right."

adjective: highest in pitch or chief among parts or voices or instruments or orchestra sections

"First soprano."

adjective: indicating the beginning unit in a series

adverb: before anything else

"First we must consider the garter snake."

adverb: the initial time

"When Felix first saw a garter snake."

adverb: prominently forward

adverb: before another in time, space, or importance

"I was here first."