えら.い 
() admirable () remarkable () greatness
えらい (adj-i) (1) great, excellent, admirable, remarkable, distinguished, important, celebrated, famous, eminent, (2) (uk) awful, terrible
いぎょう (n) great enterprise, exploits
いじん (n) great man
いだい (adj-na,n) greatness

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Etymologies: 中文字譜 : 説文解字