- rationale (behind/for/of something)
the principles or reasons which explain a particular decision, course of action, belief, etc. synonym reason基本原理;根本原因 Word Originmid 17th cent.: modern Latin, neuter (used as a noun) of Latin rationalis ‘endowed with reason’, from ratio(n-) ‘reckoning, reason’, from rat- ‘reckoned’, from the verb reri.