inlier

noun
in·​li·​er | \ ˈin-ˌlī(-ə)r How to pronounce inlier (audio) \

Definition of inlier

1 : a mass of rock whose outcrop is surrounded by rock of younger age
2 : a distinct area or formation completely surrounded by another also : enclave

First Known Use of inlier

circa 1859, in the meaning defined at sense 1

History and Etymology for inlier

in entry 3 + outlier

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The first known use of inlier was circa 1859

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to make a temporary encampment

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