English edit

Etymology edit

plane +‎ -ation

Pronunciation edit

  • IPA(key): /pleɪˈneɪʃən/, /pləˈneɪʃən/

Noun edit

planation (countable and uncountable, plural planations)

  1. (geology) The formation of a flat surface by erosion and deposition
  2. (biology) The morphological transformation of a three-dimensional structure into a two-dimensional one through development or evolution

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