sine sindry • sinecural · · · Info · Definitions · Synonyms · Characters · · sine · · Text Latin · · Script 4 · · Length Definitions · · · (noun) ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle. Synonyms: sin. · · Noun Definition 1 Synonyms · · · sin · · Synonym 1 Characters · · e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E s latin small letter s U+0073