An indentation is a notch, cut, or dent in something. If you take a hammer to a piece of metal, you will make a series of indentations.

The dent in indentation shares a root with your dentist, and an indentation is basically like a tooth mark. Except some "teeth" are larger than others — a meteorite leaves a huge indentation in the ground, just as a sharp pencil could make a tiny indentation in your finger. You can talk about conceptual indentation, too. Loving the novel Anna Karenina might make an indentation in your general aversion to reading. It’s that’s good.

Definitions of indentation
  1. noun
    the space left between the margin and the start of an indented line
    synonyms: indent, indention, indenture
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    type of:
    blank space, place, space
    a blank area
  2. noun
    the act of cutting into an edge with toothlike notches or angular incisions
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    type of:
    change of shape
    an action that changes the shape of something
  3. noun
    a concave cut into a surface or edge (as in a coastline)
    synonyms: indenture
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    a V-shaped or U-shaped indentation carved or scratched into a surface
    a V-shaped indentation
    a split or indentation in something (as the palate or chin)
    a single notch in a row of notches
    thumb index
    one of a series of rounded notches in the fore edge of a book to indicate sections
    a notch cut in the trunk of tree in order to determine the direction of its fall
    incisura, incisure
    (anatomy) a notch or small hollow
    type of:
    concave shape, concavity, incurvation, incurvature
    a shape that curves or bends inward
  4. noun
    the formation of small pits in a surface as a consequence of corrosion
    synonyms: pitting, roughness
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    type of:
    corroding, corrosion, erosion
    erosion by chemical action
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