TILDES

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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
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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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