一端|いったんittan[0]heiban (flat)

1. nounone end; an end
2. nounpart; fragment
   彼かれが亡なくなった責任せきにんの一端いったんは私に有あります。↗

   His death was partly my fault.

• Synonym一部いちぶNeutralVery common: one part, also one copy of a book; 「一端」 leans toward a small part or one end.
• Synonym一部分いちぶぶんNeutralA part or small portion of a whole; 「一端」 can also mean one end of a physical object.
• Related部分ぶぶんNeutralThe most general word for a part divided from a whole; 「一端」 leans toward a small part or one end, as in 「責任の一端」.
• RelatedセクションNeutralA loanword for a block, chapter, or department; 「一端」 means one end or a small part and never a department.
• Related局所きょくしょWrittenWritten prose for a limited area or an affected part of the body, as in 「局所麻酔」; 「一端」 means one end or a small part.
• Related局部きょくぶNeutralA limited part of a whole; also private parts or an affected area; 「一端」 refers to one end of a thing or a small part of a matter.
• RelatedパートCasualA colloquial loanword for a part or voice part, also part-time work; 「一端」 carries no sense of a role in a division of labor.
• RelatedパーツNeutralA loanword for parts, components, or body parts; 「一端」 is one end of an object or a part of a matter, not a component.
• RelatedセグメントWrittenA loanword for a divided segment, such as a market segment; 「一端」 has no sense of division by set criteria.

Use 「一端」 for one end of an object or a small part of a matter, as in 「棒の一端」 or 「責任の一端を担う」. For a part in general choose 「部分」 or 「一部」; for components use 「パーツ」. 「セクション」 covers blocks, chapters, or departments, 「セグメント」 divided segments, 「パート」 casual parts or part-time work, and 「局所」/「局部」 limited areas or affected parts.

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

1. 一番いちばん初はじめ。真っ先まっさき。
2. 一方いっぽうの端はし。
3. 一部分いちぶぶん。
4. 一角いっかく。