• An item, group, structure, or entity which is regarded as a single entity or whole. 2. A unit (1) which is a part of a larger item, group, structure, or entity. For example, a control unit, a data unit, a logic unit, or a crystal unit.
  • A piece, part, or assembly which can independently perform one or more functions. For instance, a radar unit, an amplifier, a power pack, or a rectifier unit.
  • An amount or magnitude of a physical quantity, such as mass or distance, which is utilized as a standard to express such quantities or magnitudes. For example, the defined SI unit for mass is the kilogram, and the meter serves to express distances. Such units are also used in multiples to state values, as in picogram, or kilometer. Also called unit of measurement.

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