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--- Prefix 定 TEI = "fixed | set | arranged"
定休 teikyū regular holiday 休 [rest]  Ref. 定 [to set]
定休日 teikyūbi closing day 休 [rest]  Ref. 定 [to set]
予定 yotei arrangement | plan 予 [pre-]  Ref. 定 [to set]
→ 断定 する dantei suru to conclude Ref. 定 [to set]