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til·de  (t?l?d?)n. The diacritical mark ( ~ ), used for example over the letter n in Spanish to indicate the palatal nasal sound (ny), as in cañón, “canyon,” and over the vowels a and o in Portuguese to indicate nasalization, as in pão, “bread.”[Spanish, alteration of obsolete Catalan title, from Latin titulus, superscription.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.tilde (?t?ld?) n (Phonetics & Phonology) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014til?de (?t?l d?) n., pl. -des. 1. a diacritic (~) placed over an n, as in Spanish mañana, to indicate a palatal nasal sound or over a vowel, as in Portuguese são, to indicate nasalization. 2. swung dash. [1860?65;