Reaction: nf (word from medieval Latin reactio, from actio: action).
The word “reaction” has several meanings
I) In science:
1. Mechanical: Force that a body acting on another determines in return in this one.
Principle of the equality of action and reaction, stated by Newton (*): a body which exerts a push or a pull on another receives from the latter an equal and opposite push or pull.
(*) Isaac Newton (1642-1727) is a mathematician, phy...
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