英语词源字典 - 在线词源网站

Broadway [Broadway 词源字典]: common street name, from broad (adj.) + way (n.); the allusive use for "New York theater district" is first recorded 1881.[Broadway etymology, Broadway origin, 英语词源]
off-Broadway (adj.): 1953, "experimental theater productions in New York City," from off (adv.) + Broadway. Even more experimental off-off-Broadway is attested from 1967.