sine¹ /sīn/ (mathematics)

1. One of the six trigonometrical functions of an angle, the ratio in a right-angled triangle of the side opposite the angle to the hypotenuse (abbrev sin)
2. Orig the perpendicular from one end of an arc to the diameter through the other

sinical /sinˈi-kl/ adjective

sine curve noun

A curve showing the relationship between the size of an angle and its sine, a sinusoid

sine wave noun

Any oscillation whose graphical representation is a sine curve

sine² /sīˈnē or siˈne/ (Latin)

Without

sine qua non noun /kwā non or kwä nōn/

An indispensable condition

sine die /dīˈē or diˈā/

1. Without a day (appointed)
2. (of a meeting or other business) indefinitely adjourned

sine dubio /dūˈbi-ō or doobˈi-ō/

Without doubt

sine prole /prōˈlē or prōˈle/

Without issue, without children

haversine /havˈər-sīn/ (mathematics)

Half the versed sine of an angle

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