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English definition of “rare”

rare

adjective uk   /reər/ us    /rer/

rare adjective (NOT COMMON)

B1 not common; very unusual: a rare disease/species The museum is full of rare and precious treasures. a rare occasion/opportunity/visit/treat, etc. [+ to infinitive] It's very rare to find these birds in New England in winter. It's very rare to find someone who combines such qualities.

rare adjective (OF MEAT)

C1 (of meat) not cooked for very long and still red: I'd like my steak rare, please.

rare adjective (OF AIR)

describes the air at the top of a mountain, which contains less oxygen, making it harder to breathe
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(Definition of rare from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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