perceives with eyes; observes or becomes aware of something; understands.
From Old English 'seon,' derived from Proto-Germanic 'sehwaną.' The word expanded from literal visual perception to metaphorical understanding because seeing and knowing were so closely connected in human thought.
We use 'see' for both looking with eyes and understanding with minds—'I see the point'—because ancient people literally thought understanding happened in the eyes, and language kept that metaphor alive.
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