In a way that is complete, absolute, and without any doubt or qualification.
From Greek 'kategoria' (predication/assertion), derived from 'kata-' (down/against) and 'agoreuein' (to speak). Aristotle used it to classify types of being.
This word comes from Aristotle's categories—one of the most influential ancient systems for organizing all knowledge—so when you say something categorically, you're speaking with philosophical certainty!
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