単一|たんいつtan'itsu[0]heiban (flat)

1. na-adjective, no-adjectivesingle; simple; sole; individual; unitary
   ねじ、てこ、くさび、滑車かっしゃなどは単一たんいつ機械きかいと呼よばれる。↗

   The screw, the lever, the wedge, the pulley, etc. are called simple machines.

• Related単純たんじゅんNeutralMeans simple or uncomplicated, and can also suggest a simple mind. 「単一」 instead stresses that there is only one kind, with nothing else mixed in.
• RelatedシンプルNeutralA loanword for simple and uncluttered, very common in speech and mostly about design or style rather than the number of kinds.
• Related簡単かんたんNeutralThe most common everyday word for simple and easy; it stresses low difficulty, not that only one kind exists as 「単一」 does.
• Related簡素かんそWrittenA written, formal word for plain, simplified form; it stresses stripping away excess and does not mean only one kind.
• Related簡易かんいWrittenA formal word for simplified, as in 「簡易包装」; it stresses keeping things simple, not singleness of kind.
• Related素朴そぼくNeutralMeans natural and unadorned, stressing the lack of embellishment; it mostly describes styles, not the number of kinds.
• Related平明へいめいWrittenA formal word for clear, easy-to-follow writing; it concerns how plain the expression is, not how many kinds there are.
• Related簡明かんめいWrittenA formal word for concise and clear, as in 「簡明な解説」; it stresses clarity of explanation, not singleness of kind.
• Related質素しっそNeutralDescribes a frugal, modest way of living with no luxury; it has nothing to do with there being only one kind.
• Related唯一無二ゆいいつむにWrittenA four-character idiom meaning one and only; it stresses uniqueness with a complimentary tone, while 「単一」 just counts kinds neutrally.
• Related飾り気のないかざりけのないNeutralA phrase for plain and unpretentious, used mostly of people; it has no link to being single in number or kind.
• Antonym複数ふくすうNeutralThe direct opposite of 「単一」: multiple or plural, as in 「複数回答」.
• Antonym多様たようWrittenA formal word meaning diverse or varied; it stands opposite 「単一」, which says there is only one kind.

Use 「単一」 for only one kind with nothing mixed in, as in 「単一民族」 or 「単一通貨」. For simple or easy choose 「単純」 or 「簡単」; for a clean, simple style 「シンプル」; for one and only 「唯一無二」. The opposites are 「複数」 (multiple) and 「多様」 (diverse).

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

1. ただ一ひとつであること。
2. 同一どういつのものによって構成こうせいされていること。一いち種類しゅるいであること。