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spacey

or spac·y

[spey-see]
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adjective, spac·i·er, spac·i·est.
  1. spaced-out(def 2).
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Origin of spacey

An Americanism dating back to 1965–70; space + -ey1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for spacy

spacey

adjective spacier or spaciest
  1. slang vague and dreamy, as if under the influence of drugs
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Word Origin

C20: space + -ey

Spacey

noun
  1. Kevin, original name Kevin Spacey Fowler . born 1959, US actor; films include Glengarry Glen Ross (1992), The Usual Suspects (1995), American Beauty (1999), which earned him an Academy Award, The Shipping News (2001), and Beyond the Sea (2004); artistic director of Old Vic Theatre Company, London, from 2003
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for spacy

adj.

also spacey, 1885, "large, roomy, spacious," from space (n.) + -y (2). Meaning "felt as characteristic of outer space" (especially with reference to electronic music) is attested from 1971, probably influenced by spaced-out (1965, American English slang), a reference to the behavior of people using hallucinogenic drugs (see space (v.)).

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Online Etymology Dictionary, © 2010 Douglas Harper