unit

a single thing or person.

any group of things or persons regarded as an entity.

They formed a cohesive unit.

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.

one of a number of things, organizations, etc., identical or equivalent in function or form.

a rental unit;

a unit of rolling stock.

any magnitude regarded as an independent whole; a single, indivisible entity.

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.

the least positive integer; one.

Also called unit's place. 

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

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

a machine, part, or system of machines having a specified purpose; apparatus.

a heating unit.

Education. a division of instruction centering on a single theme.

Military. an organized body of soldiers, varying in size and constituting a subdivision of a larger body.

Medicine/Medical.

1. 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.

2. the amount necessary to cause a specific effect upon a specific animal or upon animal tissues.

Mathematics.

1. an identity element.

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

a single undivided entity or whole

any group or individual, esp when regarded as a basic element of a larger whole

a mechanical part or integrated assembly of parts that performs a subsidiary function

a filter unit

a complete system, apparatus, or establishment that performs a specific function

a production unit

a subdivision of a larger military formation

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

the amount of a drug, vaccine, etc, needed to produce a particular effect

a standard measure used in calculating alcohol intake and its effect

maths

1. (usually plural) 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

2. (modifier) having a value defined as one for the system

   unit vector

Also called: unit set.  maths logic a set having a single member

short for home unit

short for stock unit

a self-propelled railcar