Compounds of 一

• お一人様
  (n) one person or customer
  (may indicate a restaurant hospitable for lone women)
• くつ一足
  (n) pair of shoes
• ごく一部
  (exp) a small fraction
  a small proportion
• どれ一つ
  (exp) not one (in sentence with negative verb)
• びた一文
  (exp) being penniless
  not having a cent
• もう一つ
  (n,adv) (uk) another
  one more
• もう一回
  (exp) once more
  once again
• もう一人
  (n,adv) another (person)
  the other person
  one more (person)
• もう一度
  (exp) once more
  again
• もう一遍
  (exp) (uk) (ksb:) once more
  again
• 安全第一
  (n) safety first
• 意識一般
  (n) transcendental appreciation
• 一か八か
  (exp,adj-no) (uk) sink or swim
  high-stakes
  desperate
• 一っ走り
  (n,vs) spin (as in 'take a car for a spin')
  run
• 一つずつ
  (n) one by one
  one each
  one at a time
• 一つづつ
  (n) one by one
  one each
  one at a time
• 一つ一つ
  (n) one-by-one
  separately
  in detail
  (P)
• 一つ覚え
  (exp) the one thing that is well-remembered
• 一つ書き
  (n) an item
  itemization
  itemisation
• 一つ置き
  (n) alternate
  every other one
• 一つ度も
  (conj) (with negative predicate) not even once, never
• 一の御子
  (n) (arch) first-born imperial prince
• 一の字点
  (n) kana iteration mark
• 一挨一拶
  (n) (arch) dialoging (with another Zen practitioner to ascertain their level of enlightenment) (source of modern word aisatsu)
• 一意専心
  (n-adv,adj-no) single-mindedly
  wholeheartedly
  with one's heart and soul
• 一衣帯水
  (n) (being separated only by a) narrow strip of water
  narrow strait (channel, river)
• 一一九番
  (n) ambulance and fire brigade emergency tel. no. (in Japan)
  (P)
• 一塩基酸
  (n,adj-no) monobasic acid
• 一価関数
  (n) single-valued function
• 一家の主
  (n) master of the household