Lewis & Short

sŭĕo, ēre [assumed as a stem for the form sŭēmus, which is probably a contracted perf., = suevimus from suesco; cf. consuesco and the Gr. εἰώθαμεν], to be wont, used, or accustomed: appellare suemus, Lucr. 1, 60: cernere suemus (dissyl.), id. 1, 301: perhibere suemus, id. 4, 369.