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/ˌser.ən'dɪp.ə.ti/

the fact of finding interesting or valuable things by chance

우연한 발견, 행운의 발견

'The discovery of penicillin was a serendipity that changed medicine forever.'

'페니실린의 발견은 의학을 영원히 바꾼 우연한 발견이었다.'