機能的に
解説 Definition
functionally は functional（機能的な）に対応する副詞で、「機能的に」という意味です。見た目や形式ではなく、実際の働きや役割の面から見てどうかを述べるときに使います。
Functionally means in terms of practical operation, purpose, or the role something performs. It is used when comparing or evaluating how things actually work, regardless of differences in appearance, design, name, or formal structure.
覚え方のコツ Memory Tip
functionally は function「機能」→ functional「機能上の」→ functionally「機能的には」と、-al と -ly を順に付けた副詞です。functionally the same/useful/equivalent のように、外観・名称・形式では違っても「実際に果たす役割という観点では」と限定するときに使います。practically は「実際上・ほぼ」の意味もあるため、機能面を明示するこの語と区別します。
Build the word in stages: function is a purpose or operation, functional means relating to practical operation, and functionally adds -ly to turn that idea into an adverb. When two machines are functionally the same, they may look different but perform the same jobs. Use this word to signal the viewpoint “in terms of what it actually does.” Common patterns include functionally identical, functionally equivalent, and functionally useful. Practically can sometimes express a similar idea, but it can also mean “almost”; functionally keeps the focus specifically on operation or role.
例文
The two machines are functionally the same.
その二つの機械は機能的には同じです。
This old phone is still functionally useful.
この古い電話は、機能的にはまだ役に立ちます。
Although the design changed, the system works functionally as before.
デザインは変わりましたが、そのシステムは機能的には以前と同じように動きます。
functionally の類義語・関連語
functionally の語源・成り立ち Etymology
ラテン語 functio（遂行）から。fungi（果たす・実行する）が語根で、-al（形容詞化）+-ly（副詞化）が付いた形。関連語: function（機能）、defunct（機能停止した）。「役割を果たすさま」が原義で、実用的・機能面でという意味で使われる。
Functionally is formed from functional and the adverbial suffix -ly. Functional combines function with -al. Function entered English from Latin functio, “performance or execution,” which derives from fungi, “to perform or fulfill.” The sequence of suffixes therefore moves from the idea of performing a role, to an adjective concerning that role, and finally to an adverb meaning “with respect to operation or purpose.” Defunct is historically related through the same Latin verb.
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