Tilde meaning

tĭldə
(1) In mathematics, the tilde (~) stands for equivalence; for example, a ~ b means "a is equivalent to b" (not equal, but comparable). It also stands for approximation. Officially written as two tildes, one over the other, the single tilde has become acceptable; for example, ~100 means "approximately 100."
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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.”
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A mark (~) used:
  • In Spanish, over an n to indicate a palatal nasal sound (ny), as in señor.
  • In Portuguese, over a vowel or the first vowel of a diphthong to indicate nasalization, as in lã, pão.
  • In some phonetic systems, for various purposes.
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A similar mark (~), used to express negation in mathematics or logic or to express similarity in geometry.
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The grapheme of character ~.
  • A diacritical mark (˜) placed above a letter to modify its pronunciation, such as by palatalization in Spanish words or nasalization in Portuguese words.
  • A punctuation mark that indicates range (from a number to another number).
  • May be used to represent approximation (mathematics).
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A key found on some types of keyboards.
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(logic) The character used to represent negation, usually ~ or ¬.
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Origin of tilde

  • Spanish alteration of obsolete Catalan title from Latin titulus superscription

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Spanish tilde, from Latin titulus (“superscript”).

    From Wiktionary