[yoo-ni-tee] /ˈyu nɪ ti/
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.
  1. the number one; a quantity regarded as one.
  2. 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
Related forms
nonunity, noun, plural nonunities.
self-unity, noun
superunity, noun
1. singleness, singularity, individuality. See union. 5. concert, unison.
1. diversity, variety.

three unities, the

See under unity (def 8).
British Dictionary definitions for three unities
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]

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Word Origin and History for three unities
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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