Rookie Noun A new recruit, especially in the army or police. “a rookie cop” Everybody starts somewhere. No matter the job, if you are new to a job, you will always be referred to as a rookie. This is especially true in the field of law enforcement and police. However, being a rookie is not that bad. Take, for example, his book about a rookie officer by Kurt Niemann; he details his experiences as a rookie probation officer. It is where he learns from the job and develops his skills to become an experienced police officer...