The difference between Multiplicity and Unity

Multiplicity as a noun:

The state of being made of multiple diverse elements.

Multiplicity as a noun (mathematics):

The number of values for which a given condition holds.

Multiplicity as a noun:

A large indeterminate number.

Multiplicity as a noun (software engineering, UML):

The number of instances that can occur on a given end of a relationship, including 0..1, 1, 0..* or *, and 1..*.

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.