1. a mechanical part or integrated assembly of parts that performs a subsidiary function
2. a complete system, apparatus, or establishment that performs a specific function
3. the amount of a drug, vaccine, etc., needed to produce a particular effect
4. a standard measure used in calculating alcohol intake and its effect
a. the first position in a place-value counting system, representing a single-digit number
b. having a value defined as one for the system
6. Maths logic a set having a single member
7. NZ a self-propelled railcar
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
in technology, a consolidated unified (normalized) assembly of a machine or complex of machines that possesses complete interchangeability and independently accomplishes isolated functions. A unit is characterized by electric motors, reducers, pumps and so forth. Sometimes the term “unit” refers to a combination of two or more machines.
In the theory of algebraic numbers and in the theory of algebraic functions, a divisor of unity is called a unit, that is, a is a unit if there exists an element b such that ab = 1.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
An assembly or device capable of independent operation, such as a radio receiver, cathode-ray oscilloscope, or computer subassembly that performs some inclusive operation or function.
An element of a ring with identity that has both a left inverse and a right inverse.
Any military element whose structure is prescribed by competent authority, such as a table of organization and equipment; specifically, part of an organization.
A standard of basic quantity into which an item of supply is divided, issued, or used.
A quantity adopted as a standard of measurement.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.