A cardinal number indicating the absence of any or all units under consideration, An argument at which the value of a function vanishes, Informal One having no influence or importance; a nonentity, adjective_ Informal Absent, inoperative, or irrelevant in specified circumstances, Having no measurable or otherwise determinable value, Linguistics Of or relating to a morpheme that is expected by an established, regular paradigm but has no spoken or written form. Moose has a zero plural; that is, its plural is moose, transitive verb_ To adjust (an instrument or a device) to zero value