Meaning of “second nature” in the English Dictionary

british dictionary

"second nature" in British English

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

"second nature" in American English

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second naturenoun [ U ]

us /ˈsek·ənd ˈneɪ·tʃər/

something that is so familiar that it is done without having to think about it:

Using the computer is second nature to me now.

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