一件|いっけんikken[1]atamadaka (head-high)

1. noun(one) matter; (one) item; (one) case
   彼かれはその一いち件けんを調査ちょうさし始はじめた。↗

   He began to look into the matter.

• Synonym件けんNeutralA neutral word for a matter or item, also used as a counter, as in 「例の件」「三件」; 「一件」 often appears in 「一件落着」, pointing to that one matter.
• Synonym事項じこうWrittenA formal word for items laid out in a list, as in 「注意事項」; 「一件」 names one matter without any sense of listing.
• Related出来事できごとNeutralA neutral word for things that happen in the world, as in 「今日の出来事」, stressing the occurrence; 「一件」 singles out one particular matter or item.
• Related事柄ことがらWrittenA word of formal prose for the content of a matter, as in 「重要な事柄」; 「一件」 treats the matter as one discrete case.
• Related事象じしょうWrittenA formal word for phenomena; in probability theory it means an event. 「一件」 is a concrete matter or item.
• Related事物じぶつWrittenA written word for things and affairs in general; 「一件」 focuses on one particular matter, as in 「例の一件」.

Use 「一件」 for one matter or that matter you both know, as in 「一件落着」「例の一件」. 「件」 is the neutral word for a matter and a counter; 「出来事」 is an occurrence; 「事柄」 is the content of a matter; 「事象」「事物」「事項」 are formal: phenomena, things in general, listed items.

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

1. 一ひとつの事件じけんや案件あんけん。
2. ある事柄ことがら。例れいの事柄ことがら。