How to say "exclusively" in Japanese

• もっぱらJLPT N1approx.Common
  adverb, no-adjectiveUse this for 'exclusively' meaning 'solely, wholly, entirely': one activity or concern receives all of someone's time, attention, or effort. Typical contexts describe a person devoted wholly to a single pursuit.
  その特権とっけんはもっぱらご婦人ふじんだけに限かぎられている。↗

  The privilege is reserved exclusively for women.
• いっぺんCommon
  noun (suffix)Covers 'exclusively' in the sense 'only; alone', but is seldom the word you want: いっぺん is really the word for 'once', so reach for もっぱら when you mean 'solely, wholly'.

For 'exclusively' as 'solely, wholly', use 「もっぱら」; 「いっぺん」 matches the 'only, alone' sense but is seldom the word you want, since it really means 'once'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• もっぱらwholly
• 専一せんいちexclusively
• いっぺんexclusively