Twain/tweɪn/ Definition 1 of 1Pro Tip 1/3Literary Use Used mainly in literature to add a classical or historical flair. The knights battled until they were parted in twain. Pro Tip 2/3Outdated Term Modern English typically uses 'two' instead of 'twain' in everyday conversation. We need two tickets, not 'twain tickets', for the show. Pro Tip 3/3Emotional Impact Using 'twain' can evoke a sense of drama or emphasize a separation. Their hearts were one, but destiny bound them in twain.