Rocker (Noun) — A performer, composer or fan of rock music.
Rocker (Noun) — A teenager or young adult in the 1960s who wore leather jackets and rode motorcycles.
Rocker (Noun) — A chair mounted on a curved support so that it can rock back and forth.
Rocker (Noun) — A trough that can be rocked back and forth; used by gold miners to shake auriferous earth in water in order to separate the gold.
Rocker (Noun) — An ice skate with a curved blade.
Rocker (Noun) — A curved support that permits the supported object to rock to and fro.
Rocker (Noun) — An attendant who rocks a child in a cradle.