longitude /ˈlɑnd͡ʒəˌtud/ noun3 •Angular distance measured west or east of the prime meridian. •Any imaginary line perpendicular to the equator and part of a great circle passing through the North Pole and South Pole. •(no longer used) Length.His shoulders are remarkably sloping, giving an appearance of great longitude to his neck. — 1831 formslongitudes