unity

Unity is being in harmony or one in spirit. (noun)

An example of unity is a bride and groom both lighting a single candle at the same time with each of their candles.

See unity in Webster's New World College Dictionary

noun pl. unities

the state of being one, or united; oneness; singleness
something complete in itself; single, separate thing
the quality of being one in spirit, sentiment, purpose, etc.; harmony; agreement; concord; uniformity
1. unification
2. a unified group or body
the quality or fact of being a totality or whole, esp. a complex that is a union of related parts
1. an arrangement of parts or material in a work of art or literature, that will produce a single, harmonious effect
2. a design or effect so produced
constancy, continuity, or fixity of purpose, action, etc.
Math.
1. any quantity, magnitude, etc. considered or identified as a unit, or 1
2. the numeral or unit 1

See unity in American Heritage Dictionary 4

(yo͞oˈnĭ-tē)

noun pl. u·ni·ties

The state or quality of being one; singleness.
The state or quality of being in accord; harmony.
a. The combination or arrangement of parts into a whole; unification.
b. A combination or union thus formed.
Singleness or constancy of purpose or action; continuity: “In an army you need unity of purpose” (Emmeline Pankhurst).
a. An ordering of all elements in a work of art or literature so that each contributes to a unified aesthetic effect.
b. The effect thus produced.
One of the three principles of dramatic structure derived by French neoclassicists from Aristotle's Poetics, stating that a drama should have but one plot, which should take place in a single day and be confined to a single locale.
Mathematics
a. The number 1.
b. See identity element.