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trig (adj.)

"smart, trim," c. 1200, from Old Norse tryggr "firm, trusty, true," from Proto-Germanic *treuwaz "having or characterized by good faith," from PIE *drew-o-, a suffixed form of the root *deru- "be firm, solid, steadfast." A Scottish and northern word only until 19c. Related: Trigness.

trig (n.)

1895 as a shortening of trigonometry.

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Definitions of trig
1
trig (n.)
the mathematics of triangles and trigonometric functions;
Synonyms: trigonometry
2
trig (adj.)
neat and smart in appearance;
the trig corporal in his jaunty cap
Synonyms: clean-cut / trim
From wordnet.princeton.edu