Reciprocátio, onis, f. g. Verbale. Pli. A going back or returning to the place it came fro: an ebbing.Reciprocornes.Rammes with hornes turning forwarde and backward againe.
Lewis and Short: Latin dictionary
rĕcīprŏcātĭo, ōnis, f. [reciproco]. I.Lit., a going back upon itself, a returning by the same way, retrogression (postAug.): aestus, i. e.