expression, noun
A hypothetical omniscient being from classical mechanics, often used in discussions of determinism and free will.
ラプラスの悪魔は、物理学の決定論を象徴する存在だ。
Laplace's demon is a being that symbolizes determinism in physics.
もしラプラスの悪魔が存在したら、未来は完全に予測できるだろう。
If Laplace's demon existed, the future could be completely predicted.