What's the difference between i.e. and e.g.?
early 15c., from Old French incomparable (12c.) or directly from Latin incomparabilis, from in- "not" (see in- (1)) + comparabilis "comparable" (see comparable).
mathematics Two elements a, b of a set are incomparable under some relation <= if neither a <= b, nor b <= a. (1995-09-21)