noun, noun or participle which takes 'suru', intransitive verb
action; effect; function; operation
Broad term for the working, effect, or influence of something, often used in scientific, technical, and abstract contexts. Can refer to physical forces, chemical reactions, or the function of a system.
薬の作用で熱が下がった。
The fever went down due to the action of the medicine.
重力が物体に作用する。
Gravity acts on objects.