Pronunciation: (til'du), [key]
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.
2. See swung dash.
3. Math.a symbol (~) indicating equivalency or similarity between two values.
4. Logic.a similar symbol indicating negation.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.