Noun
1. gage
2. measuring instrument, measuring system, measuring device, standard of measurement
3. standard, criterion, measure, touchstone, distance
4. length, thickness
5. bore
Verb
1. caliber, calibre, diameter, diam, estimate
2. approximate, guess, judge, calculate, cipher, cypher, compute, work out, reckon, figure, rub
3. determine
4. find, find out, ascertain, quantify
5. measure, standardize
6. standardise, blend
6. flux, mix, conflate, commingle, immix, fuse, coalesce, meld, combine, merge