The kanji character 阿 primarily conveys the meanings of "a" or "an" (as a prefix), "flatter," "toady," or "familiar" or "intimate." It can also be used as a phonetic component, so its specific meaning often depends on the words it forms. It can sometimes refer to a familiar or close person.

・On-yomi (音読み): ア (a) ・Kun-yomi (訓読み): None, or rarely used as お (o) in some old expressions.

⚫︎阿部さん Translation: Mr./Ms. Abe (A common Japanese surname). ⚫︎阿呆 Translation: ア阿ホウ (aho) - fool, idiot. The 阿 here is used phonetically and intensifies the meaning. ⚫︎阿弥陀如来 Translation: ア阿ミダニョライ (Amida Nyorai) - Amitabha Buddha. 阿 is used as a prefix here.

The kanji 阿 is a 形声文字 (keisei moji), which means a character combining a phonetic component with a semantic one. It is composed of the radical 阜(also written as 阝 on the left side, representing a "mound" or "hill") and the phonetic component 可. The 可 part contributes to the sound (the sound "a") and the 阜 part suggests a relationship to something that is high or prominent. The initial meaning, which later became obsolete, related to a type of servant or helper. Over time, the meaning shifted and it was used as a prefix to certain words, or to refer to the sound of something.