The difference between Unit and Unity

Unit as a noun (mathematics):

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

Unit as a noun (sciences):

A standard measure of a quantity.

Unit as a noun:

The number one.

Unit as a noun:

Unit as a noun:

An organized group comprising people and/or equipment.

Unit as a noun (military, informal):

A member of a military organization.

Unit as a noun (US, military):

Any military element whose structure is prescribed by competent authority, such as a table of organization and equipment; specifically, part of an organization.

Unit as a noun (US, military):

An organization title of a subdivision of a group in a task force.

Unit as a noun (US, military):

A standard or basic quantity into which an item of supply is divided, issued or detailed. In this meaning, also called unit of issue.

Unit as a noun (US, military):

With regard to Reserve Components of the Armed Forces, denotes a Selected Reserve unit organized, equipped, and trained for mobilization to serve on active duty as a unit or to augment or be augmented by another unit. Headquarters and support functions without wartime missions are not considered units.

Unit as a noun (algebra):

The identity element, neutral element.

Unit as a noun (algebra):

An element having an inverse, an invertible element; an associate of the unity.

Unit as a noun (category theory):

In an adjunction, a natural transformation from the identity functor of the domain of the left adjoint functor to the composition of the right adjoint functor with the left adjoint functor.

Unit as a noun (geology):

A volume of rock or ice of identifiable origin and age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it.

Unit as a noun (commerce):

An item which may be sold singly.

Unit as a noun (UK):

A unit of alcohol.

Unit as a noun (UK, electricity):

One kilowatt-hour (as recorded on an electricity meter).

Unit as a noun (Australia, New Zealand):

a measure of housing equivalent to the living quarters of one household, an apartment where a group of apartments is contained in one or more multi-storied buildings or a group of dwellings is in one or more single storey buildings, usually arranged around a driveway.

Unit as a noun (historical):

A gold coin of the reign of James I, worth twenty shillings.

Unit as a noun:

A work unit.

Unit as a noun (UK, slang):

A physically large person.

Unit as an adjective:

For each unit.

Unit as an adjective (mathematics):

Having a size or magnitude of one.

Unity as a noun (uncountable):

Oneness; the state or fact of being one undivided entity.

Unity as a noun:

A single undivided thing, seen as complete in itself.

Unity as a noun (drama):

Any of the three classical rules of drama: unity of action (nothing should be admitted not directly relevant to the development of the plot), unity of place (the scenes should be set in the same place), and unity of time (all the events should be such as might happen within a single day).

Unity as a noun (mathematics):

The number 1 or any element of a set or field that behaves under a given operation as the number 1 behaves under multiplication.

Unity as a noun (legal):

The peculiar characteristics of an estate held by several in joint tenancy.

Unity as a noun (Quakerism):

The form of consensus in a Quaker meeting for business which signals that a decision has been reached. In order to achieve unity, everyone who does not agree with the decision must explicitly stand aside, possibly being recorded in the minutes as doing so.