What is the meaning of Rookie?

An inexperienced recruit, especially in the police or armed forces.

A novice.

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.

A type of firecracker, used by farmers to scare rooks.

Non-professional; amateur

To be a rookie; to go through one's inexperienced learning period in a job, team, or organization.

To haze one or more rookies as an initiation ritual.

rookie

Source: wiktionary.org