tilde

[til-duh]
noun
1.
a diacritic (~) placed over an n, as in Spanish mañana, to indicate a palatal nasal sound or over a vowel, as in Portuquese são, to indicate nasalization.
3.
Mathematics. a symbol (∼) indicating equivalency or similarity between two values.
4.
Logic. a similar symbol indicating negation.

Origin:
1860–65; < Spanish < Latin titulus superscription. See title

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
tilde (ˈtɪldə)
 
n
the diacritical mark (~) placed over a letter to indicate a palatal nasal consonant, as in Spanish señor. This symbol is also used in the International Phonetic Alphabet to represent any nasalized vowel
 
[C19: from Spanish, from Latin titulus title, superscription]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

tilde
1864, from Sp., metathesis of Catalan title, from L. titulus "inscription, heading" (see title).
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

tilde definition

character
"~" ASCII character 126.
Common names are: ITU-T: tilde; squiggle; twiddle; not. Rare: approx; wiggle; swung dash; enyay; INTERCAL: sqiggle (sic).
Used as C's prefix bitwise negation operator; and in Unix csh, GNU Emacs, and elsewhere, to stand for the current user's home directory, or, when prefixed to a login name, for the given user's home directory.
The "swung dash" or "approximation" sign is not quite the same as tilde in typeset material but the ASCII tilde serves for both (compare angle brackets).
[Has anyone else heard this called "tidal" (as in wave)?]
(1996-10-18)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
We place a tilde over the symbol to indicate that it is relative to the vertical diameter.
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