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noun
1.
a single thing or person.
2.
any group of things or persons regarded as an entity:
They formed a cohesive unit.
3.
one of the individuals or groups that together constitute a whole; one of the parts or elements into which a whole may be divided or analyzed.
4.
one of a number of things, organizations, etc., identical or equivalent in function or form:
a rental unit; a unit of rolling stock.
5.
any magnitude regarded as an independent whole; a single, indivisible entity.
6.
Also called dimension. any specified amount of a quantity, as of length, volume, force, momentum, or time, by comparison with which any other quantity of the same kind is measured or estimated.
7.
the least positive integer; one.
8.
Also called unit’s place.

(in a mixed number) the position of the first digit to the left of the decimal point.
(in a whole number) the position of the first digit from the right of the decimal point.

9.
a machine, part, or system of machines having a specified purpose; apparatus:
a heating unit.
10.
Education. a division of instruction centering on a single theme.
11.
Military. an organized body of soldiers, varying in size and constituting a subdivision of a larger body.
12.
Medicine/Medical.

the measured amount of a substance necessary to cause a certain effect; a clinical quantity used when a substance cannot be readily isolated in pure form and its activity determined directly.
the amount necessary to cause a specific effect upon a specific animal or upon animal tissues.

13.
Mathematics.

an identity element.
an element in a group, ring, etc., that possesses an inverse.

noun
1.
a distinct part or component of something larger
noun
1.
a single undivided entity or whole
2.
any group or individual, esp when regarded as a basic element of a larger whole
3.
a mechanical part or integrated assembly of parts that performs a subsidiary function: a filter unit
4.
a complete system, apparatus, or establishment that performs a specific function: a production unit
5.
a subdivision of a larger military formation
6.
Also called unit of measurement. A standard amount of a physical quantity, such as length, mass, energy, etc, specified multiples of which are used to express magnitudes of that physical quantity: the second is a unit of time
7.
the amount of a drug, vaccine, etc, needed to produce a particular effect
8.
a standard measure used in calculating alcohol intake and its effect
9.
(maths)

(usually pl) the first position in a place-value counting system, representing a single-digit number: in the decimal system the number 27 has 7 units and 2 tens
(modifier) having a value defined as one for the system: unit vector

10.
(maths, logic) Also called unit set. a set having a single member
11.
short for home unit
12.
short for stock unit
13.
(NZ) a self-propelled railcar

unit u·nit (yōō’nĭt)
n.

An entity regarded as an elementary structural or functional constituent of a whole.

A precisely specified quantity in terms of which the magnitudes of other quantities of the same kind can be stated.

The quantity of a serum, drug, or other agent necessary to produce a specific effect.

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