ra·tio·nal·i·ty /ˌræʃəˈnæləti/
  合理性,純理性,辨別道理
  ra·tio·nal·i·ty /ˌræʃəˈnælətɪ/ 名詞
  合理性
  Ra·tion·al·i·ty n.; pl. -ties   The quality or state of being rational; agreement with reason; possession of reason; due exercise of reason; reasonableness.
     When God has made rationality the common portion of mankind, how came it to be thy inclosure?   --Gov. of Tongue.
     Well-directed intentions, whose rationalities will never bear a rigid examination.   --Sir T. Browne.
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  rationality
       n 1: the state of having good sense and sound judgment; "his
            rationality may have been impaired"; "he had to rely
            less on reason than on rousing their emotions" [syn: reason,
             reasonableness]
       2: the quality of being consistent with or based on logic [syn:
           rationalness]