Meaning of “concave” in the English Dictionary

"concave" in British English

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concaveadjective

uk /ˈkɒŋ.keɪv/ us /ˈkɑːn.keɪv/

curving in:

a concave lens
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concavity
noun [ C or U ] uk /ˌkɒnˈkæv.ə.ti/ us /ˌkɑːnˈkæv.ə.t̬i/

(Definition of “concave” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"concave" in American English

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concaveadjective

us /kɑnˈkeɪv, kɑŋ-/

curved inward:

a concave lens

(Definition of “concave” from the Cambridge Academic Content Dictionary © Cambridge University Press)