indentation > define

noun

• A concave cut into a surface or edge (as in a coastline.
  • synonyms: indenture
• The formation of small pits in a surface as a consequence of corrosion.
  • synonyms: pitting, roughness
• The space left between the margin and the start of an indented line.
  • synonyms: indention, indent, indenture
• The act of cutting into an edge with toothlike notches or angular incisions. .

• (n.) A notch or recess, in the margin or border of anything; as, the indentations of a leaf, of the coast, etc.
• (n.) A recess or sharp depression in any surface.
• (n.) The act of indenting or state of being indented.
• (n.) The measure of the distance; as, an indentation of one em or of two ems.
• (n.) 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.