indentation Meaning, Definition & Usage

  1. noun a concave cut into a surface or edge (as in a coastline)
    indenture.
  2. noun the formation of small pits in a surface as a consequence of corrosion
    pitting; roughness.
  3. noun the space left between the margin and the start of an indented line
    indention; indent; indenture.
  4. noun the act of cutting into an edge with toothlike notches or angular incisions

WordNet

In`den*ta"tion noun
Definitions
  1. The act of indenting or state of being indented.
  2. A notch or recess, in the margin or border of anything; as, the indentations of a leaf, of the coast, etc.
  3. A recess or sharp depression in any surface.
  4. (Print.) (a) The act of beginning a line or series of lines at a little distance within the flush line of the column or page, as in the common way of beginning the first line of a paragraph. (b) The measure of the distance; as, an indentation of one em, or of two ems.

Webster 1913