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til· de | \ ˈtil-də \ Definition of tilde 1: a mark ˜ placed especially over the letter n (as in Spanish señor sir) to denote the sound \nʸ\ or over vowels (as in Portuguese irmã sister) to indicate nasality 2a: the mark used to indicate negation in logic and the geometric relation "is similar to" in mathematics b: the mark used to indicate an approximate value such as x~y
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