Translation guide
The English word "integral" has two main uses: (1) describing something as essential or necessary for completeness, and (2) referring to the mathematical concept. This guide focuses on the first, more common meaning, and briefly covers the mathematical term.
Describing something that is necessary and important, forming a fundamental part of a whole.
The most direct and common translation for "integral" in the sense of "essential" or "indispensable." Often used in the pattern ～に不可欠だ.
水は生命に不可欠だ。
Water is integral to life.
彼の貢献はプロジェクトの成功に不可欠だった。
His contribution was integral to the project's success.
Means "required" or "mandatory." Slightly stronger than 不可欠, often used for things that are absolutely necessary.
このソフトを使うには登録が必須です。
Registration is integral to using this software.
A common, slightly less formal way to say "indispensable" or "essential." Literally "cannot be omitted."
チームワークは成功に欠かせない要素だ。
Teamwork is an integral element for success.
A very natural, everyday expression meaning "cannot do without." Often used in speech.
彼女はこのチームになくてはならない存在だ。
She is an integral part of this team.
Used to describe something that is so closely connected it forms a single entity. Often in the pattern ～と一体だ.
理論と実践は一体だ。
Theory and practice are integral.
Describing something that is built in or included as a component, often in technical or design contexts.
Means "built-in" or "integrated" for hardware or features. Commonly used for electronics.
このカメラはGPSを内蔵している。
This camera has an integral GPS.
Refers to something embedded or built into a system, often used in software or engineering.
A literal translation meaning "included as a part." Use only when explaining the concept, not as a natural equivalent.
This is a literal explanation, not a common natural phrase. Prefer 内蔵 or 組み込み for technical contexts.
送料は料金の一部として含まれています。
Shipping is integral to the price.
The mathematical operation of integration in calculus.
The standard mathematical term for "integral."
この関数の積分を求めなさい。
Find the integral of this function.
English "integral" is sometimes used loosely to mean "important" or "involved." In Japanese, 不可欠 implies absolute necessity. If the meaning is weaker, consider 重要 (じゅうよう, important) or 関わっている (かかわっている, involved).
不可欠 (ふかけつ) means "indispensable" and is often used for abstract qualities. 必須 (ひっす) means "mandatory" and is common for requirements, rules, or concrete items. 必須 is slightly stronger and more formal.
組み込みシステムは多くの家電に使われている。
Integral systems are used in many home appliances.