·pl of Apparatus.
II. Apparatus ·noun Things provided as means to some end.
III. Apparatus ·noun A collection of organs all of which unite in a common function; as, the respiratory apparatus.
IV. Apparatus ·noun Hence: A full collection or set of implements, or utensils, for a given duty, experimental or operative; any complex instrument or appliance, mechanical or chemical, for a specific action or operation; machinery; mechanism.