(US, military) A standard or basic quantity into which an item of supply is divided, issued, or used. In this meaning, also called unit of issue.
(US, military) With regard to Reserve Components of the Armed Forces, denotes a Selected Reserve unit organized, equipped, and trained for mobilization to serve on active duty as a unit or to augment or be augmented by another unit. Headquarters and support functions without wartime missions are not considered units.
(algebra) The identity element, neutral element.
(algebra) An element having an inverse, an invertible element; an associate of the unity.
(Australia, New Zealand) a measure of housing equivalent to the living quarters of one household, an apartment where a group of apartments is contained in one or more multi-storied buildings or a group of dwellings is in one or more single storey buildings, usually arranged around a driveway.
