unilateral UK [ˌjʉː.nɪˈlæt.ə.ɹɫ̩]US [ˌjʉː.nəˈɫæɾ.ɚ.ɻɫ̩] adjective3 •Done by one side only. •Affecting only one side of the body. •Binding or affecting one party only. formsmore unilateral · most unilateral