dilatation n. + Add to list US //ˌdɪɫəˈteɪʃən// UK //daɪlɐtˈeɪʃən// di·lata·tion SynonymsEtymology Synonyms dilationdistensiondistentionOriginLA-LATdīlātātio→OFRdilatation→ENdilatation From Old French dilatation, from Late Latin dīlātātio, early 15th c.