Less common or happening less frequently than something else; more scarce or unusual.
From Old English 'rare,' derived from Latin 'rarus' meaning 'thinly sown' or 'having intervals.' The comparative form 'rarer' adds the -er suffix to indicate a greater degree of rarity.
The word 'rare' originally described how seeds were planted far apart, which is why something scarce still feels 'spread out' or hard to find—the metaphor stuck around for 1,000 years!
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