A person or thing that causes something; an agent responsible for producing an effect.
From 'cause' plus the agent suffix '-er,' which creates nouns denoting someone or something that performs an action. This is a straightforward English derivation paralleling words like 'maker' or 'teacher.'
In law and ethics, identifying the causer of harm is crucial—but sometimes a chain of causers makes responsibility murky, which is why philosophical causation debates have real-world consequences!
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