SINE Meaning of SINE in English I sine noun, in trigonometry BrE AmE saɪn▷ sines saɪnz▶ ˈ sine wave BrE AmE II sine preposition, Latin BrE AmE ˈsɪn i ˈsaɪn-, ˈsiːn-, -eɪ —see also phrases with this word Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012