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
2
a
: 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
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Merriam-Webster unabridged
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