numeric / prefix:

• one - １ can also be read ワン. 壱, 弌 and 壹 are used in legal documents ➜ ワン

~の noun / suffix:

• best

~の noun:

• first; foremost

noun:

• beginning; start
• ace (playing card) ➜ エース
• bottom string (on a shamisen, etc.)

noun:

• K-1 (Japanese kick-boxing promotion)

noun:

• informal wedding ceremony ➜ 二次会

numeric:

• one

noun:

• for one thing - often used in itemized lists
• only - after a noun
• (not) even - with a verb in negative form

adverbial noun:

• just (e.g. "just try it")

noun / ~の noun:

• number one; first; first place

adverb:

• best; most

noun:

• game; round; bout

adverb:

• as a test; as an experiment; by way of experiment; by way of trial; tentatively ➜ 試しに

noun:

• song (e.g. in noh); piece

noun:

• one person - esp. 一人
• alone; unmarried; solitary ［ひとり］ - esp. 独り

noun:

• one day
• first day of the month ➜ ついたち

noun:

• first day of the month - usu. 一日 or １日
• first ten days of the lunar month ［ついたち］ - archaism

noun:

• the tenth day of the month
• ten days

adverbial noun:

• once; one time; on one occasion
• temporarily; for a moment ［ひとたび］
• one degree; one tone; one musical interval ［いちど］

adjectival noun / adverb / noun / ~の noun:

• amount necessary to fill a container (e.g. cupful, spoonful, etc.); drink (usu. alcoholic)
• full
• one squid, octopus, crab, etc.; one boat

adverb / ~の noun / adjectival noun:

• fully; to capacity - usually written using kana alone
• a lot; much - usually written using kana alone

suffix noun / adverbial noun:

• all of ...; the entire ... - usually written using kana alone

temporal noun / suffix:

• one by one; each; one at a time

noun:

• one face; one surface
• the whole surface
• one aspect; one side

noun / adverbial noun:

• (on) the other hand
• one broad, flat object
• front page (e.g. newspaper)

noun:

• 10 minutes

adverbial noun:

• October

adverbial noun:

• December

adverbial noun:

• January

adverbial noun:

• November

noun:

• 15; fifteen

noun:

• thirteen; 13
• king (playing card)

noun:

• twelve; 12
• queen (playing card)

noun:

• eleven; 11 ［じゅういち］
• jack (playing card)
• Hodgson's hawk-cuckoo (Cuculus fugax); Horsfield's hawk cuckoo - ateji derived from its call - usually written using kana alone

noun:

• one long cylindrical thing; one film, TV show, etc.; one goal, home run, etc.; one telephone call ➜ 本【ほん】
• one version
• one book; a certain book
• ippon; one point; a blow - Martial Arts term
• experienced geisha ➜ 半玉【はんぎょく】

suffix noun:

• single-minded focus on ... - after a noun, usu. as 〜一本で, 〜一本に, etc.

adverbial noun:

• once; one time; one round; one game; one bout; one heat; one inning

noun:

• 100,000,000; one hundred million

noun / ~の noun:

• first place; first rank; unit's position ［いちい］

noun:

• Japanese yew (Taxus cuspidata) - usu. イチイ, also 櫟 - usually written using kana alone

noun:

• one week

adverbial noun / temporal noun:

• (a) step
• level; stage
• small degree; small amount