(1)   The act of cutting into an edge with toothlike notches or angular incisions
(2)   The space left between the margin and the start of an indented line
(3)   The formation of small pits in a surface as a consequence of corrosion
(4)   A concave cut into a surface or edge (as in a coastline)


  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. 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.
  5. A measure of the distance from the flush line; as, an indentation of one em, or of two ems.