二十一代集

にじゅういちだいしゅう

noun

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Collections of the Twenty-One Eras, twenty-one collections of waka compiled by imperial command (early Heian to early Muromachi)

二	two, two radical (no. 7)
十	ten
一	one, one radical (no.1)
代	substitute, change, convert, replace, period, age, counter for decades of ages, eras, etc., generation, charge, rate, fee
集	gather, meet, congregate, swarm, flock