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atto-
word-forming element meaning "one quintillionth," 1962, from Danish atten "eighteen" (a quintillion is 10 to the 18th power), related to Old English eahtatene (see eighteen).
updated on December 08, 2012
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Dictionary entries near atto-
attire
attitude
attitudinal
attitudinise
attitudinize
atto-
attorn
attorney
attorney-general
attract
attraction