How to say "specification" in Japanese

• 指定していJLPT N2approx.Common
  noun, suru verb, transitive verbCovers specification in the sense of designating or fixing which one: naming a particular person, place, date, or requirement. It is about pointing out and assigning, not about writing something down.
  切符きっぷを申し込もうしこまれる際さいは代替日だいたいびもご指定していください。↗

  When applying for tickets, please give alternative dates.
• 明記めいきCommon
  noun, suru verb, transitive verbSpecification as clear writing: putting details down explicitly in a document so nothing is left vague; typical when terms or conditions are written out clearly, as in a contract.
  とりあえずまともな人間にんげんはいないということを明記めいきしておきたい。↗

  In any case I just want to make clear that the fact that these are not normal people.
• 明示めいじCommon
  no-adjective, suru verb, transitive verbSpecification as explicit statement: making something clear and explicit instead of leaving it implied, in speech or in writing. Typical when a rule, condition, or intention is spelled out openly.

Use 指定 for specifying or designating which person, place, or thing is meant; use 明記 when something is specified clearly in writing; use 明示 when it is stated explicitly rather than left implicit.

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

• 指定していdesignation
• 明記めいきclear writing
• 明示めいじelucidation
• 仕様しよう(technical) specification