Confined to one side only.
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uni·lat·er·al .yü-ni-'lat-ə-rəl, -'la-trəl adj occurring on, performed on, or affecting one side of the body or one of its parts <\unilateral exophthalmos>
uni·lat·er·al·ly -ē adv
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adj.
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uni·lat·er·al (u″nĭ-latґər-əl) [uni- + lateral] affecting but one side.Medical dictionary. 2011.