Any piece of equipment, such as an appliance, power tool, stereo system, computer, tractor, or machinery.

• This air-conditioner is the most efficient unit we sell.

businesscommerceretailA structure used to display goods for sale (usually containing shelves, pegs or hooks)

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.

• The new apartment complex will have 50 units.

medicinesciencesA quantity of approximately 517 milliliters (1.1 U.S. pints) of blood.

governmentmilitarypoliticsAny military element whose structure is prescribed by competent authority, such as a table of organization and equipment; specifically, part of an organization.

governmentmilitarypoliticsAn organization title of a subdivision of a group in a task force.

governmentmilitarypoliticsA standard or basic quantity into which an item of supply is divided, issued, or detailed.

governmentmilitarypoliticsWith 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.

algebramathematicssciencesThe identity element, the neutral element.

• An element 𝑒 of 𝑆 such that 𝑒𝑥 = 𝑥 = 𝑥𝑒 for all 𝑥 ∈ 𝑆 is called a unit element. (When the law of composition is written additively, the unit element is denoted by 0, and is called a zero element.)

algebramathematicssciencesAn element having an inverse, an invertible element; an associate of the unity.

• Let 𝐴 be an arbitrary integral domain. We say that an element 𝑎 ∈ 𝐴 is invertible or is a unit of 𝐴 if it has an inverse in 𝐴; in ℤ the units are ±1, […]

category-theorycomputingengineeringIn an adjunction, a natural transformation from the identity functor of the domain of the left adjoint functor to the composition of the right adjoint functor with the left adjoint functor.

geographygeologynatural-sciencesA volume of rock or ice of identifiable origin and age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it.

• For example, the Moenkopi Formation was named for the small settlement of Moenkopi, Arizona where the formation was first defined as being a separate unit from the rocks above and beneath it.

A unit of alcohol.

businesselectrical-engineeringelectricityOne kilowatt-hour (as recorded on an electricity meter).

historicalA gold coin of the reign of James I, worth twenty shillings.

A work unit.

slangA physically large person.

• Luca's father, Americo Campanaro, said: "I feel like my heart has been ripped out." Mr Campanaro added: "He was a big lad, a big unit, that's why he was a goalkeeper, with a big heart to match. A gentle giant."

vulgarslangA penis, especially a large one.