Floor

Japanese: 階 - かい

[1] [noun] ① a staircase; a staircase; a tier. ※Shiji Sho (1477), 9: “The platform has three tiers.” [Rites – Book of Rites, Vol. 1] ② A division into higher and lower ranks. A grade of official rank, rank, or rank. ※Utsubo (c. 970-999), Kuniyori no Suke (The Crown Prince passed through the fourth rank and became a scholar, the Right Minister, third rank.” [Pan Yue – Jida Fu] ③ A certain layer in a building. ※Maruzen and Mitsukoshi (1920), Terada Torahiko: “Sometimes you are made to walk every floor from end to end.” ④ A geological system that corresponds to a “period” in geological time. A layer deposited during a period. [2] [suffix] ① Used to count the ranks. ※Engishiki (927) 18 "The selectors will recite _{the official} chant at the head of the class. The ranks will recite the _official chant at the back. If they do _not reach the top within three days, they will be ranked _one floor _below ."② Used to count the floors of a building. ※Heike (early 13th century) 5 "More than a thousand people climbed up to the top of the second floor of the Great Buddha Hall."③ In mathematics, it is used to indicate the highest order of the derivative of an unknown function included in a differential equation. For example, if it is three, it is called a third-order differential equation.

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

Japanese:

[1] 〘名〙① きざはし。きだはし。あがりだん。階段。段。※史記抄（1477）九「言は壇は階三重なり」〔礼記‐曲礼上〕② 位の上下のわかち。官位、位階、階級などの等級。きざみ。※宇津保（970‐999頃）国譲下「東宮のすけ、四位、階こえて学士の右大弁三位になる」〔潘岳‐藉田賦〕③ 建築物で、ある一つの層。※丸善と三越（1920）〈寺田寅彦〉「凡ての階を隅から隅迄歩かせられる事もある」④ 地質時代の「期」に相当する地質系統。期の期間に堆積した地層。[2] 〘接尾〙① 位階の等級を数えるのにいう。※延喜式（927）一八「凡選人長上於_レ官引唱。番上於_レ省引唱。若三日之内不_レ到者。降_二一階_一叙」② 建築物の層を数えるのにいう。※平家（１３Ｃ前）五「大仏殿の二階の上には千余人のぼりあがり」③ 数学で、微分方程式に含まれる未知関数の導関数の最高次数を示すのに用いる。それがたとえば三ならば三階の微分方程式という。

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