Basic English Definition

noun

A constructed language introduced in 1930 by British linguist Charles Kay Ogden (1889–1957), using a simplified form of the basic grammar and core vocabulary of English.

American Heritage

A simplified form of the English language, devised around 1930 by Brit. linguist and writer C. K. Ogden (1889-1957), and proposed for use as an international auxiliary language and for beginning studies in English: it consists of a selected vocabulary of 850 essential words and is copyrighted.

Webster's New World