rare Definition in Cambridge British English Dictionary
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Definition of "rare" - British English Dictionary

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rareadjective

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.
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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)

used to describe 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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