INDENTATION

In′den‐ta″tion (?), n. 1. 1. The act of indenting or state of being indented.
2. 2. A notch or recess, in the margin or border of anything; as, the indentations of a leaf, of the coast, etc.
3. 3. A recess or sharp depression in any surface.
4. 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.
Hanging, or Reverse, indentation, indentation of all the lines of a paragraph except the first, which is a full line.