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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English trig, tryg, from Old Norse tryggr (“loyal, faithful, true”), from Proto-Germanic *triwwiz (“loyal, faithful, true”). Cognate with Old English trīewe (“faithful, loyal, true”). More at true.
trigonometry
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Classic usage
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