Entry 3 senses · 3 variants Webster, 1913 Seaboard /sēb'-ôrdˌ/ · Sea·board · IPA /sˈiːbˌɔrd/ n. a. adv. 01 n. The seashore; seacoast. 1. The seashore; seacoast. 02 a. Bordering upon, or being near, the sea; seaside; seacoast; as, a seaboard town. 1. Bordering upon, or being near, the sea; seaside; seacoast; as, a seaboard town. 03 adv. Toward the sea. 1. Toward the sea.[R.]