A

Japanese: エー

〘Noun〙 (A, a)① The first letter of the English alphabet. ② The first in a series. "Class 3A"③ The most excellent. "Class A", "A grades"④ A vitamin. ⑤ One of the ABO blood types. Type A. ⑥ (A) The symbol for ampere, the unit of electric current. ⑦ One of the standard sizes of paper. A size. "A5 size"⑧ (a) In mathematics, the symbol for the first known number when several known numbers are given. ⑨ (First letter of answer) In mathematics, the answer. ⑩ (A) The old symbol for the element argon. Currently written as Ar. ⑪ (a) The symbol for are, a unit of area. ⑫ (A・Å) The symbol for angstrom, a unit for measuring the wavelength of light. ⑬ (A) One of the British and American musical notations in Western music. In German, it is "Ah." It corresponds to the Japanese notation "I." ⑭ The front side of a record or cassette tape. Side A. *Furukawa Roppa's Diary - December 28, 1934 (Showa 9) "I finished one record and only did the second record, A, but there was no plan for B, so I decided to record it again in January."

A

〘Noun〙 (E, e) One of the German note names in Western music. The Japanese note name Ho, the Italian and French note name Mi.

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

Japanese:

〘名〙 (A, a)① 英語のアルファベットの第一字。② 連続したもののうち第一番目のもの。「三年Ａ組」③ 最もすぐれたもの。「Ａクラス」「成績がＡ」④ ビタミンの一つ。⑤ ＡＢＯ式血液型の一つ。Ａ型。⑥ (Ａ) 電流の単位、アンペアの記号。⑦ 紙の大きさの規格の一つ。Ａ判。「Ａ５判」⑧ (ａ) 数学で、既知数が幾つか与えられている時、第一の既知数を示す記号。⑨ (answer の頭文字) 数学で、答。⑩ (Ａ) 古く用いたアルゴンの元素記号。現在は Ar と記す。⑪ (ａ) 面積の単位、アール（are）を表わす記号。⑫ (Ａ・Å) 光の波長などをはかる単位、オングストローム（Ångström）を表わす記号。⑬ (Ａ) 洋楽の英米音名の一つ。ドイツ音名では「アー」。日本音名の「イ」に当たる。⑭ レコード盤やカセットテープの表側の面。Ａ面。※古川ロッパ日記‐昭和九年（1934）一二月二八日「一枚すんで、二枚目のＡだけやったが、Ｂの案無く、又一月に吹込むことにした」