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Webster 1913 Edition

Noun.

Indentation; an impression like that made by a tooth.

ppr.

Cutting into notches.

Binding out by covenants in writing.

indenting

indenting ‎(plural indentings)

indentation
- Antoni van Leeuwenhoek
  From this Observation, I was induced to examine the grains of Wheat themselves, in order to investigate, how, and for what purpose they were formed with those indentings, chinks, or creases.