n.
Pronunciation: ' til-d ə
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 \ n y \ or over vowels (as in Portuguese irmã sister) to indicate nasality
2 a : the mark tilde used to indicate negation in logic and the geometric relation “ is similar to ” in mathematics b : the mark tilde used to indicate an approximate value