Rotation

Japanese: 回転 - かいてん

〘noun〙① To turn around. Also, to spin. *Sihe Ruhai (early 17th century) 14 "It is said that the spinning of the tessellate's heart gave rise to the heart of an enchanting love." *Shami Kaizong (1837-47) "By spinning the bottle, the phosphorus is spread throughout the bottle and then tightly sealed up and stored." [Book of the Later Han - Biography of Yu Xu] ② When a figure or object in a plane or space rotates a certain angle around a point or a straight line without changing the relative positions of each point, or when it continues to rotate. Also, the operation of rotating. Rotational movement. [English-Japanese Dictionary of Mathematical Dictionary (1889)] ③ To turn one thought after another according to the situation. ※Kin (1926)〈Miyajima Sukeo〉 13 "Anything can happen depending on how your mind works while you're sleeping . " ④ The cycle in which things go from beginning to end. Especially the efficiency of customers constantly coming and going at restaurants. Also, the cycle until invested funds are recovered. ※Roppa Shokudan (1955)〈Furukawa Midoriha〉 Amawanakyudai III "Unlike the feeling of being rushed through the so-called 'rotation' one after another, it feels like you're being told to 'take your time,' and it's nice." ⑤ Abbreviation of 'kaitenkyogi' (slalom race).

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙① くるっとまわること。また、まわすこと。※四河入海（１７Ｃ前）一四「銕石の心を回転して蜿媚の心を生じたと云心ぞ」※舎密開宗（1837‐47）内「壜を回転して燐をして普く壜内に布達せしめ密に口を栓塞し貯ふ」〔後漢書‐虞詡伝〕② 平面や空間の図形や物体が、その各点の相互の位置関係を変えることなく、ある点や直線のまわりを一定角だけまわること、あるいは、まわりつづけること。また、そのまわす操作。回転移動。回転運動。〔数学ニ用ヰル辞ノ英和対訳字書（1889）〕③ 事に応じて次々と考えをめぐらすこと。※金（1926）〈宮嶋資夫〉一三「寝てゐた間の頭の回転(クヮイテン)の工合によってどんな事にでもなって行く」④ 物事が初めから終わりまでめぐる一巡。特に、飲食店などで、客が次々に入れかわる効率。また、投資された資金が回収されるまでの一巡。※ロッパ食談（1955）〈古川緑波〉甘話休題III「後から後からと、所謂『廻転』を急いで、追ひ立てられる感じと違って、『何卒ごゆっくり』と言はれてゐるやうで気持がいい」⑤ 「回転競技(かいてんきょうぎ)」の略。

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