functional

正常に機能する、使用可能な

正常に動き、使える状態にあること。

やさしい英語で： Working properly and ready to be used.

• The old radio is still functional.
• Repairs made the heating system fully functional.
• Are all the machines functional now?

類義語： working, operational

反対語： broken

よく使う表現： fully functional, functional equipment, remain functional

実用的な、機能的な

特定の仕事や目的に役立つこと。

やさしい英語で： Useful for a particular job or purpose.

• This bag is attractive and functional.
• The shelves make the room more functional.
• They designed a functional kitchen with plenty of storage.

類義語： useful, practical

反対語： useless

よく使う表現： functional furniture, functional design, functional space

機能本位の、実用本位の

飾りや美しさより、役目を果たすことを重視して作られた様子。

やさしい英語で： Designed mainly to do a job, with little attention to decoration or beauty.

• The room has purely functional furniture.
• They built a functional concrete shelter.
• The station is functional, with little decoration.

類義語： utilitarian, plain

反対語： decorative

よく使う表現： purely functional, functional building, functional architecture

汎関数

関数を入力として受け取り、数を結果として返す数学の規則。

やさしい英語で： A mathematical rule that takes a function as its input and gives a number as its result.

• This functional returns a real number.
• The integral defines a linear functional.
• We proved that the functional is continuous.

よく使う表現： linear functional, continuous functional, bounded functional