Definitions from Wiktionary ( )

▸ noun:  An inexperienced recruit, especially in the police or armed forces.
▸ noun:  A novice.
▸ noun:  An athlete either new to the sport or to a team or in his/her first year of professional competition, especially said of baseball, basketball, hockey and American football players.
▸ noun:  (British) A type of firecracker, used by farmers to scare rooks.
▸ adjective:  Non-professional; amateur
▸ verb:  (intransitive) To be a rookie; to go through one's inexperienced learning period in a job, team, or organization.
▸ verb:  (transitive, chiefly sports) To haze one or more rookies as an initiation ritual.

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