Something is already running along a steady path — a planet round its star, a season that comes the same way every year, a person going calmly through a morning. Then something small touches it from the side. The path does not break; it bends. You only notice because you knew what the path was supposed to look like. That is what this word points at: the bend, not the break, and the outside push that caused it.
From the word’s history
The supplied source traces the word through Middle French perturbation and Old French perturbacion back to Latin perturbatio. It is the noun that belongs with the verb perturb, so the word names the being-stirred itself rather than the thing that does the stirring.
資料裡的來源是中古法文 perturbation、古法文 perturbacion，再往上是拉丁文 perturbatio。它是動詞 perturb 的名詞，所以這個字指的是「被攪動」這件事本身，不是攪動它的那個東西。
Wiktionary etymology supplied in evidence packet (kaikki:3f6f69a190036ae4:544524932): Middle French perturbation < Old French perturbacion < Latin perturbatio.
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