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Rookie is a term for a person who is in their first year of play of their sport and has little or no professional experience.
By extension the term has come to mean anyone new to a profession, training or activity (e.g. rookie cop, rookie pilot, as a synonym for recruit), or occasionally to a freshman (especially in athletic teams).
Rookies can be submitted to hazing as a pledge in some clubs.
The term rookie has been modified in some online communities and is often referred to as simply rook, which means noob or newbie.
In most sports there are traditions in which rookies must do things or tricks are played on them. Such as baseball where players usually have to dress-up in strange costumes.