[ 'tɪldə ]
■ noun an accent (˜) placed over Spanish n when pronounced ny (as in señor ) or Portuguese a or o when nasalized (as in São Paulo ), or over a vowel in phonetic transcription, indicating nasalization.
↘a similar symbol used in mathematics and logic to indicate negation, inversion, etc.
Origin
C19: from Sp., based on L. titulus (see title ).