1) An indentation or notch 2) State of being indented 3) The act of indenting 
• (n.) Same as Indentation, 4.
In·den'tion noun (Print.) Same as Indentation , 4. 
the indenting of a line or lines in writing or printing. · the blank space left by indenting. · the act of indenting; state of being indented. · an indentation or notch.
the space left between the margin and the start of an indented