sine /saɪn/ BrE AmE noun [countable] technical ( written abbreviation sin )
[ Date: 1500-1600 ; Language: Medieval Latin ; Origin: sinus , from Latin ; ⇨ ↑ sinus ]
the ↑ fraction (2) calculated for an angle by dividing the length of the side opposite it in a ↑ triangle that has a ↑ right angle , by the length of the side opposite the right angle
⇨ ↑ cosine , ↑ tangent