Denshi Jisho — Online Japanese dictionary

毎日 まいにち every day
Common word, Adverbial noun, Temporal noun 
毎日毎日 まいにちまいにち day after day; day by day
Adverb, No-adjective 
毎日新聞社 まいにちしんぶんしゃ Mainichi Newspapers Co. Ltd
Noun 

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