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/pleɪˈneɪʃən/ · noun
(geology) The formation of a flat surface by erosion and deposition.
Use planation when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Planation means (geology) The formation of a flat surface by erosion and deposition.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use planation where its definition matches the intended context.
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