一体|いったいittai[0]heiban (flat)

1. adverb(what) the heck; (why) in the world; (who) on earth; (where) the hell; (how) the hellbefore an interrogative; forms an emphatic question
   一体いったいどこで彼かれに会あったんだ。↗

   Where on earth did you meet him?

   いったいなぜ彼かれを駅えきに連つれて行いったの？↗

   Why on earth did you take him to the station?
2. nounone object; one body; one unit; one group; one mass
   ストライキとは従業員じゅうぎょういんの集団しゅうだんが一体いったいとなって就労しゅうろうを拒否きょひすることです。↗

   A strike is a mass refusal to work by a body of employees.
3. nounone form; one style; one format; one fashion
4. nounone Buddhist image; one carving; one sculpture
5. nounone corpse; one sample (of bones, remains, etc.)
6. adverbgenerally; in general; on the whole; by and large; for the most partalso as ～に
7. adverbstrictly speaking; in the first place; originally; to begin with

• Related総体そうたいWrittenWritten word for 'the whole' or 'on the whole'. In everyday speech say 「全体」; it does not express 「一体」's unified-whole or 'the heck' senses.
• Related一体にいったいにWrittenWritten adverb meaning 'on the whole, generally speaking'. Although it starts with 「一体」, it has nothing to do with the interrogative 「一体」 ('the heck').
• Related全体にぜんたいにNeutralNeutral adverb for a comment about a whole range, as in 「全体に暗い」. 「一体」 as a noun means a single unified body, so the two are not interchangeable.
• Related全般的にぜんぱんてきにWrittenWritten-leaning adverb meaning 'overall, across the board'. It differs from both the 'the heck' sense and the unified-whole sense of 「一体」.
• Antonym分離ぶんりNeutralNeutral noun for separating things, the opposite of 「一体」's sense of forming one body, as in 「政教分離」.
• Antonym別々べつべつNeutralNeutral word for keeping things separate, as in 「別々に払う」; the opposite of 「一体」's sense of joining into one.

「一体」 as an adverb usually asks 'the heck/in the world'; as a noun it means one unified body. For 'on the whole' use 「全体に」 or the written 「全般的に」/「総体」; for things kept apart use 「別々」 or 「分離」.

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

1. 一ひとつのからだ。同体どうたい。
2. ひとつにまとまること。一丸いちがん。
3. （「一体（に）いったい」の形かたちで副詞ふくし的てきに）全体ぜんたいに。総そうじて。
4. 疑問ぎもんの意いを強調きょうちょうしたり、とがめる意味いみを表あらわす。一体いったい全体ぜんたい。はたして。まったく。
5. そもそも。元来がんらい。大体だいたい。