Entry 2 senses · 2 variants Webster, 1913 Colombo · IPA /kəˈlɒm.bəʊ/ prop. n. n. 01 prop. n. The (official) capital city of Sri Lanka. Population (2000) = 1,994,000. 1. The (official) capital city of Sri Lanka. Population (2000) = 1,994,000.(Geography) 02 n. See Calumba. 1. See Calumba.(Med.) See: Calumba