twain /tweɪn/adjective 1noun 1number 1verb 1forms 3 adjective1 •(rare) twofold noun1 •Pair, couple.The susceptible twain, on the search for adventure, dropped in. — 1903 number1 •(old-fashioned) twoBut the warm twilight round us twain will never rise again.Bring me these twain cups of wine and water, and let us drink from the one we feel more befitting of this day. verb1 •To part in twain; divide; sunder. formstwained · twaining · twains