Definitions for rankerˈræŋ kər
Random House Webster's College Dictionary
a person who ranks.
Brit. a soldier in the ranks or a commissioned officer promoted from the ranks.
Origin of ranker:
a commissioned officer who has been promoted from enlisted status
an enlisted soldier who serves in the ranks of the armed forces
One who ranks things, or arranges them in ranks.
one who ranks, or disposes in ranks; one who arranges