ダイ 
() topic () subject
                     
だい (n) (1) title, subject, theme, topic, (2) problem (on a test), question, (n-suf,ctr) (3) counter for questions (on a test)
だいする (vs-s) to be titled (e.g. a book), to be named
だいざい (n) subject, theme
だいじ (n) letters in a title
だいめい (n) title

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Etymologies: 中文字譜 : 説文解字