The Wordsmith Dictionary

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New American Oxford Dictionary

planation

pla na tion |plāˈnāSHən pleɪˈneɪʃən | ▶noun the leveling of a landscape by erosion. ORIGIN late 19th cent.: from plane 1 + -ation .

Oxford Dictionary

planation

planation |pləˈneɪʃ (ə )n | ▶noun [ mass noun ] the levelling of a landscape by erosion. ORIGIN late 19th cent.: from plane 1 + -ation .