of or pertaining to a unit or units.
of, pertaining to, characterized by, or aiming toward unity: the unitary principles of nationalism.
of the nature of a unit; having the indivisible character of a unit; whole.
serving as a unit, as of measurement or estimation.
of or pertaining to the use of units: A unitary method was applied.
Government. of or pertaining to a system of government in which the executive, legislative, and judicial powers of each state in a body of states are vested in a central authority.

1810–20; unit, unit(y) + -ary

unitariness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unitary (ˈjuːnɪtərɪ, -trɪ)
1.  of a unit or units
2.  based on or characterized by unity
3.  individual; whole
4.  Compare federal of or relating to a system of government in which all governing authority is held by the central government

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
If anything, it's sort of counterintuitive that the unitary family has persisted so long and pervasively in our society.
Some comments imply there is a unitary state, homogenous in all respects.
While every unitary operator is an isometry, not every isometry is unitary.
The present state of the universe is related to the state the early universe was in via a unitary transformation.
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