事（こと、koto）
- thing/matter

The Japanese word 事 [事]（こと） is a versatile noun that has several meanings, often relating to "thing," "matter," "event," "circumstance," or "fact." It functions as a general-purpose word and is frequently used to make abstract concepts more concrete or to refer to specific situations. 事 [事] can also indicate "a thing that should be done" or "a task".

⚫︎仕事 Translation: Work, job. ⚫︎食事 Translation: Meal, dining. ⚫︎事件 Translation: Incident, event.

⚫︎事 [事] is used in a wide variety of contexts. ⚫︎It's common to see 事 [事] combined with other words to create new compound words (like the examples above). ⚫︎It can refer to tangible or intangible things. ⚫︎It's often used when talking about actions, occurrences, or topics. ⚫︎When used with verbs, 事 [事] often nominalizes the verb, turning it into a noun (e.g., 食べる (taberu - to eat) becomes 食べること (taberuこと - the act of eating)).

⚫︎事 [事] is most commonly written using the kanji 事. ⚫︎The reading is usually こと in hiragana. ⚫︎There is only one main way to write 事 [事] in the form of hiragana and kanji. ⚫︎Okurigana (the suffix hiragana) is not applicable because it is a single-character word.

⚫︎物（もの） - thing, object (more concrete). ⚫︎件（けん） - matter, case (formal, often used in legal or official contexts). ⚫︎出来事（できごと） - event, happening. ⚫︎問題（もんだい） - problem, issue.

There aren't direct antonyms because 事 [事] is a general term. Its opposite depends on the specific meaning being conveyed.

これは大切な事 ・Translation: This is an important thing. ・Explanation: Here, 事 [事] refers to "thing" or "matter."

彼の話は本当の事だった。 ・Translation: His story was true. ・Explanation: In this case, 事 [事] means "fact" or "truth."

The kanji 事 (Shì in Mandarin Chinese) originally depicted a hand holding a weapon or tool, which represented "to deal with" or "to handle." Over time, the meaning evolved to encompass "matter," "affair," and "thing." Its use as a general-purpose noun, こと, is a later development in Japanese.