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[soo-per-kal-uh-fraj-uh-lis-tik-ek-spee-al-i-doh-shuh s] /ˌsu pərˌkæl əˌfrædʒ əˌlɪs tɪkˌɛk spiˌæl ɪˈdoʊ ʃəs/
(used as a nonsense word by children to express approval or to represent the longest word in English.) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Contemporary definitions for supercalifragilisticexpialidocious

a nonsense word meaning fantastic; also called supercalifragilistic

Word Origin

popularized by the movie 'Mary Poppins''s 21st Century Lexicon
Copyright © 2003-2014, LLC
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Word Origin and History for supercalifragilisticexpialidocious

from song in 1964 Disney movie version of "Mary Poppins;" subject of a lawsuit based on earlier song title "Supercalafajalistickexpialadojus" (1949), but other versions of the word also were in circulation.

Online Etymology Dictionary, © 2010 Douglas Harper
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