Definition from
macmillandictionary.com
tangent
 definition
and synonyms
noun
[
countable
]
maths
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/
ˈtændʒ(ə)nt
/
singular
tangent
plural
tangents
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1
a
straight
line
that
touches
the
edge
of a
circle
but
does
not
pass
through it
Synonyms and related words
Lines and flat surfaces:
arc
,
axis
,
chord
...
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2
in a
right

angled
triangle
, the
measurement
of an
acute
angle
that is
equal
to the
length
of the side
opposite
the
angle
divided
by the
length
of the side between the
angle
and the
right
angle
Synonyms and related words
Describing and measuring angles:
cos
,
cosine
,
cotangent
...
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phrases
go off at/on a tangent