noun

• The act of indenting or state of being indented.
• A notch or recess, in the margin or border of anything.
• A recess or sharp depression in any surface.
• (typography) 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.
• A measure of the distance from the flush line.
• (law) A division unit of a piece of law distinguished by its indentation or by a dash.