Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

The word rationalismus could not be parsed. Trying a normal dictionary lookup:

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rătĭōnālis, e, adj. [ratio].

  1. I. Of or belonging to accounts (post-Aug.): LITTERAE, Inscr. (a. p. Chr. 193) Orell. 39.
    Hence, subst.
          1. (α) rătĭōnālis, is, m., an accountant, receiver of revenue, treasurer, Lampr. Alex. Sev. 45; 46; Capitol. Gord. 7; Commod. ap. Capitol. Albin. 2; Amm. 15, 3, 4; Inscr. Orell. 1090.
          2. (β) rătĭōnāle, is, n., the oracular breastplate of the Jewish highpriest, Vulg. Exod. 25, 7; id. Lev. 8, 8; also called rationale judicii (transl. of LXX. τὸ λογεῖον τῆς κρίσεως), id. Exod. 28, 15.
  2. II. Of or belonging to reason, reasonable, rational, endowed with reason: falsa est (finitio), si dicas, Equus est animal rationale: nam est equus animal, sed irrationale, Quint. 7, 3, 24: homo est animal rationale, id. 5, 10, 56; cf. id. 5, 8, 7; and: nec si mutis finis voluptas, rationalibus quoque: quin immo ex contrario, quia mutis, ideo non rationalibus, id. 5, 11, 35; so without a subst.: a rationali ad rationale (translatio), id. 8, 6, 13.
    1. B. Reasonable, depending on reason: in causā rationali, Auct. Her. 2, 12, 18: philosophia, i. e. logic, Sen. Ep. 89, 17; also called rationalis pars philosophiae, Quint. 12, 2, 10: disciplina, i. e. theoretical science (opp. to usus and experimenta), Cels. praef.; also ars, id. ib.; hence, rationalis medicina, theoretical therapeutics; and rationales medici, medical theorists, id. ib.
      1. 2. In rhet., i. q. ratiocinativus, of or belonging to a syllogism, syllogistic: genus (quaestionum), Quint. 3, 5, 4; 6, 54; 78; 86; cf. status, id. 3, 6, 56; 66.
        Hence, adv.: rătĭōnālĭter, in a reasonable manner, reasonably, rationally, Sen. Ep. 109; Tert. Anim. 16 al.