Sensation or sensory perception, especially as a philosophical or medical concept; the capacity to feel or perceive.
From Greek 'aisthesis' (perception, sensation). The -sis ending preserves the Greek nominative form, creating a technical medical and philosophical term.
Ancient Greek philosophers used 'aisthesis' to distinguish sense perception from pure reason—this debate about whether we know the world through feeling or thinking is still central to philosophy today, thousands of years later.
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