The subject or main idea that is being talked, written, or thought about.
It comes from Latin 'topica', from Greek 'topika', meaning 'matters concerning places', from 'topos' meaning 'place'. In ancient logic, 'topics' were 'places' in the mind where you could find arguments.
Originally, a 'topic' was like a mental shelf where you 'placed' ideas so you could find them later. When you 'stay on topic', you’re really staying in the same mental place instead of wandering off.
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