unilateral : Idioms & Phrases
Unilateral contract
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noun a one-sided agreement whereby you promise to do (or refrain from doing) something in return for a performance (not a promise)
WordNet
(Law) , a contract or engagement requiring future action only by one party.
Webster 1913
unilateral descent
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noun line of descent traced through one side of the family
WordNet
unilateral paralysis
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noun paralysis of one side of the body
hemiplegia.