The condition of being unable to see, either literally due to visual impairment or figuratively due to lack of awareness or understanding.
From Old English 'blind' of Germanic origin, related to 'blend' (to mix), possibly originally meaning 'confused' or 'dark'. The suffix '-ness' creates an abstract noun denoting a state or condition, forming a word that has maintained both literal and metaphorical meanings throughout its history.
Blindness beautifully illustrates how physical conditions become metaphors for mental states - we speak of 'blind spots' in thinking and 'blind faith' in belief. The word's connection to 'blend' suggests that blindness was once conceptualized as a mixing or confusion of visual input rather than its absence, showing how understanding of sensory experience has evolved.
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