I. ˈtrig adjective
Etymology: Middle English, trusty, nimble, of Scandinavian origin; akin to Old Norse tryggr faithful; akin to Old English trēowe faithful — more at true
Date: 1513
1. : stylishly or jauntily trim
everything was trim and trig and bright — Mark Twain
2. : extremely precise : prim
3. dialect chiefly British : firm , vigorous
II. noun
Etymology: by shortening
Date: circa 1878
: trigonometry