One who, or that which, works; a laborer; a performer; as, a worker in brass.
- One who works at a particular occupation or activity: an office worker.
- One who does manual or industrial labor.
- A member of the working class.
- A member of a colony of social insects such as ants, bees, wasps, or termites, usually a sterile female but often a sexually immature individual of either sex, that performs specialized work such as building the nest, collecting and storing food, and feeding other members of the colony.