Definitions for "Indentation"
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.
Whitespace inserted at the beginning of a line. Different textual areas in input files use different, user-configurable rules to determine the type and amount of whitespace.
Indentation is the blank space at the beginning of a line. Lisp, like many other programming languages, has conventions for the indentation of code to make it more readable. The editor is designed to facilitate such indentation.
A notch or recess, in the margin or border of anything; as, the indentations of a leaf, of the coast, etc.
A recess or sharp depression in any surface.
a concave cut into a surface or edge (as in a coastline)
Keywords:  ems, distance, measure, two, one
The measure of the distance; as, an indentation of one em, or of two ems.
Keywords:  pocket, hollow, skin
A hollow or pocket in the skin.
Keywords:  width, column, short, measure, refers
Refers to any measure short of the column width.
Keywords:  act
The act of indenting or state of being indented.