Sik·kim (s?k??m) A state of northeast India in the eastern Himalaya Mountains between Nepal and Bhutan. Long isolated from the outside world, Sikkim was settled by Tibetans who established a kingdom there in the 1600s. A British protectorate after 1890, Sikkim passed to India in 1950 and became a state of that country in 1975.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Sikkim (?s?k?m) n (Placename) a state of NE India, formerly an independent state: under British control (1861?1947); became an Indian protectorate in 1950 and an administrative division of India in 1975; lies in the Himalayas, rising to 8600 m (28 216 ft) at Kanchenjunga in the north. Capital: Gangtok. Pop: 540 493 (2001). Area: 7096 sq km (2740 sq miles)Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Sik?kim (?s?k ?m) n. a state in NE India, in the Himalayas between Nepal and Bhutan. 406,457; 2818 sq. mi. (7298 sq. km). Cap.: Gangtok. Sik`kim?mese?, n., pl. -ese, adj. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.