terrain

US /təˈren/

UK /təˈreɪn/

B1
n. (u.)Uncountable NounCharacteristics (e.g. rough) of a piece of land
The explorer had traveled all over the mountains for many years and knew the terrain well
n. (u.)Uncountable NounAn area of activity or knowledge.
She was on familiar terrain when discussing financial matters.

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