A substance that flows freely, like liquid or gas. Also used as an adjective meaning smooth, graceful, or adaptable to change.
From Latin 'fluidus', meaning 'flowing', from 'fluere' (to flow). The scientific definition emerged in the 17th century, while the figurative meaning of 'adaptable' developed later.
The beauty of 'fluid' lies in its versatility - from describing water and air to describing smooth dance movements or flexible gender identity. The word itself flows between literal and metaphorical meanings just like the substances it describes!
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