Definition of unilateral
1a
: done or undertaken by one person or party
b
: of, relating to, or affecting one side of a subject : one-sided
c
: constituting or relating to a contract or engagement by which an express obligation to do or forbear is imposed on only one party
2a
: having parts arranged on one side
a unilateral raceme
b
: occurring on, performed on, or affecting one side of the body or one of its parts
unilateral exophthalmos
3
: unilineal
4
: having only one side
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Merriam-Webster unabridged
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Time Traveler for unilateral
The first known use of unilateral was in 1802
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