'Rationale' definitions:

Definition of 'rationale'

(from WordNet)
noun
(law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature); "the rationale for capital punishment"; "the principles of internal-combustion engines" [syn: rationale, principle]

Definition of 'Rationale'

From: GCIDE
  • Rationale \Ra`tion*a"le\ (r[a^]sh`[u^]*n[a^]l" or r[a^]sh`[u^]n*[=a]"l[-e]), n. [L. rationalis, neut. rationale. See Rational, a.] An explanation or exposition of the principles of some opinion, action, hypothesis, phenomenon, or the like; also, the principles themselves. [1913 Webster]

Synonyms of 'rationale'

From: Moby Thesaurus