indention vs indentation

indention and indentation both are nouns.

Word	Noun	Adjective	Verb	Adverb
indention	Yes	No	No	No
indentation	Yes	No	No	No

As nouns, indention and indentation are synonyms defined as:

indention and indentation: the space left between the margin and the start of an indented line

Other synonyms of indention include indent, indenture.

indention (noun)	indentation (noun)
the space left between the margin and the start of an indented line	the act of cutting into an edge with toothlike notches or angular incisions
	the space left between the margin and the start of an indented line
	the formation of small pits in a surface as a consequence of corrosion
	a concave cut into a surface or edge (as in a coastline)