Lewis & Short

rĕmissīvus, a, um, adj. [remitto] (late Lat.).

  1. I. In medicine, relaxing, laxative: relaxare tumentia rebus congruis et remissivis, Cael. Aur. Acut. 3, 4.
  2. II. In gram.: adverbia, formed to express the idea in a weakened or moderated sense, remissive (like pedetentim, paulatim, sensim, etc.), Prisc. p. 1021 P.