noun

1. A particular, minute unit of mass, defined differently for different substances, but so that varying substances of the same general type have the property that one international unit of the one has the same effect on the human body as one international unit of the other.

Synonyms: IU

noun

1. Oneness, singularity, seen as a component of a whole number; a magnitude of one.

2. A standard measure of a quantity.

   “The centimetre is a unit of length.”

3. The number one.

Synonyms: identity element, unit element, unity

adjective

1. For each unit.

   “We have to keep our unit costs down if we want to make a profit.”

2. Having a size or magnitude of one.