Indention (noun)
The act of indenting a line of text by including blank space at the beginning
“indentation”
Indentation (noun)
The act of indenting or state of being indented.
Indentation (noun)
A notch or recess, in the margin or border of anything
“the indentations of a leaf”
“indentations of the coast”
Indentation (noun)
A recess or sharp depression in any surface.
Indentation (noun)
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.
Indentation (noun)
A measure of the distance from the flush line
“an indentation of one em”
Wiktionary