peneplain

noun
pe·ne·plain | \ˈpē-ni-ˌplān, ˈpe- \
variants: or less commonly peneplane

Definition of peneplain 

: a land surface of considerable area and slight relief shaped by erosion

First Known Use of peneplain

1889, in the meaning defined above

History and Etymology for peneplain

Latin paene, pene almost + English plain or plane

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The first known use of peneplain was in 1889

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