いち
一

numeric, prefix

壱, 弌 and 壹 are used in legal documents.
  1. one, 1.

takes genitive case の, suffix

  1. best.

takes genitive case の

  1. first, foremost.

noun

  1. beginning, start.

noun used as a prefix

Before a noun.
  1. a (single), one (of many).

noun

  1. ace (playing card).
  2. bottom string (on a shamisen, etc.).

Variations

Pronunciation Kanji Kana Is Common
いち
一
 一 いち ✔
いち
１
 １ いち
いち
壱
 壱 いち
いち
弌
 弌 いち
いち
壹
 壹 いち

Contained Kanji Breakdown

one, one radical (no.1)
イチ　いっ　ひと- (1st, N5)