[Sp. tilde, a popular metathetic form of the type *tidlo for tit(u)lo, ad. L. titulus TITLE. Diez cites as a parallel instance cabildo, L. capitulum.] The diacritic mark ~ placed in Spanish above the letter n to indicate the mouillé or palatalized sound (ny), as in señor (senyor).

1

  Orig. the mouillé sound was written nn, as in the parallel ll; the tilde is an abbreviated form of the second n.

2

1864.  in Webster.

3

1889.  Pall Mall G., 21 Jan. It is not considered [by the authoress] of any importance if the word señor remains without its tilde.

4