Definition from
macmillandictionary.com
cosine
 definition
and synonyms
noun
[
countable
]
maths
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/
ˈkəʊˌsaɪn
/
singular
cosine
plural
cosines
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in a
right

angled
triangle
, the
measurement
of an
acute
angle
that is
equal
to the
length
of the side between the
angle
and the
right
angle
divided
by the
length
of the
hypotenuse
Synonyms and related words
Describing and measuring angles:
cos
,
cosine
,
cotangent
...
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