numeric

  1. one.

noun

  1. for one thing. Often used in itemized lists.
  2. only. After a noun.
  3. (not) even. With a verb in negative form.

noun, adverb

  1. just (e.g. "just try it").

takes genitive case の

  1. some kind of, one type of.

Variations

Pronunciation Kanji Kana Is Common
 
一つ ひとつ
 
1つ ひとつ
ひとつ

Contained Kanji Breakdown

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