noun, plural unities.
the state of being one; oneness.
a whole or totality as combining all its parts into one.
the state or fact of being united or combined into one, as of the parts of a whole; unification.
absence of diversity; unvaried or uniform character.
oneness of mind, feeling, etc., as among a number of persons; concord, harmony, or agreement.
the number one; a quantity regarded as one.
identity ( def 9 ).
(in literature and art) a relation of all the parts or elements of a work constituting a harmonious whole and producing a single general effect.
one of the three principles of dramatic structure (the three unities) derived from Aristotelian aesthetics and formalized in the neoclassic canon in which a play is required to represent action as taking place in one day (unity of time) as occurring within one place (unity of place) and as having a single plot with a beginning, middle, and end (unity of action)

1250–1300; Middle English unite < Old French < Latin ūnitās, equivalent to ūn(us) one + -itās -ity

nonunity, noun, plural nonunities.
self-unity, noun
superunity, noun

1. singleness, singularity, individuality. See union. 5. concert, unison.

1. diversity, variety.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unity (ˈjuːnɪtɪ)
n , pl -ties
1.  the state or quality of being one; oneness
2.  the act, state, or quality of forming a whole from separate parts
3.  something whole or complete that is composed of separate parts
4.  mutual agreement; harmony or concord: the participants were no longer in unity
5.  uniformity or constancy: unity of purpose
6.  maths
 a.  the number or numeral one
 b.  a quantity assuming the value of one: the area of the triangle was regarded as unity
 c.  the element of a set producing no change in a number following multiplication
7.  the arrangement of the elements in a work of art in accordance with a single overall design or purpose
8.  any one of the three principles of dramatic structure deriving from Aristotle's Poetics by which the action of a play should be limited to a single plot (unity of action), a single location (unity of place), and the events of a single day (unity of time)
[C13: from Old French unité, from Latin ūnitās, from ūnus one]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1300, from Anglo-Fr. unite, O.Fr. unite (c.1200), from L. unitatem (nom. unitas) "oneness, sameness, agreement," from unus "one" (see one).
Online Etymology Dictionary, © 2010 Douglas Harper
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