Indentation

1. n. The measure of the distance; as, an indentation of one em, or of two ems.
2. n. The act of indenting or state of being indented.
3. n. A notch or recess, in the margin or border of anything; as, the indentations of a leaf, of the coast, etc.
4. n. A recess or sharp depression in any surface.
5. 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.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.