Main Entry: til·de

Pronunciation: \ˈtil-də\

Function: noun

Etymology: Spanish, from Medieval Latin titulus tittle

Date: circa 1864

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