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Definition of planation
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< planarian
planchet >
pla·na·tion
(pl
-n
sh
n)
KEY
NOUN:
The process of erosion and deposition in which a nearly level surface is produced, as by streams, wind, or ocean currents.
ETYMOLOGY:
Latin
pl
num
,
flat surface
; see
plane
1
+
-ation
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