Plural of reality: the actual facts or things that exist, as opposed to what is imagined or wished for.
From Latin 'realis' (relating to things), derived from 'res' (thing). It entered English through Old French in the 14th century and has been used philosophically for centuries.
Philosophers have argued for thousands of years about what counts as 'reality'—some thought only ideas are real (idealism), others thought only physical things are real (materialism), which is why this one word holds so many competing meanings!
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