rational /ˈræʃənl̟/ adjective Learner's definition of RATIONAL
1
: based on facts or reason and not on emotions or feelings基于事实(或理性)的;理智的;合理的 -
a rational decision/choice理智的决定/选择
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I'm sure there is a rational [=sensible, reasonable] explanation for his decision.我确信他的决定有合理的解释。
2
: having the ability to reason or think about things clearly有理性的;头脑清醒的 — opposite irrational — rationality
/ˌræʃəˈnæləti/ noun, formal [noncount]