GNU Collaborative International Dictionary of English

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1.       
   ‖Tilde , n. [Sp., fr. L. titulus a superscription, title, token, sign. See Title, n.] The accentual mark placed over n, and sometimes over l, in Spanish words [thus, ñ], indicating that, in pronunciation, the sound of the following vowel is to be preceded by that of the initial, or consonantal, y.
   1913 Webster