A. A habitual exercise of somebody: my custom of studying slightly before snooze. See Synonyms at routine. syn: custom, pattern, observe suggest a longtime technique for performing items. custom, placed on a Local community or to someone, indicates a roughly long-lasting way of acting bolstered by tradition and social attitudes: https://customfeltpennant86260.angelinsblog.com/37103834/the-5-second-trick-for-personalized-pennant-flags