indentation - Dictionary definition and meaning for word indentation
in+Dent--recess occuring in rocks as if your teeth(DENT) have cut IN to the rock.
what dentists do..whatever they do(like filling..).. they indent the teeth a bit.
In+dent+ation Dent means notch or mark. So indentation means mark danana car per or on any thing else.
putting dent in the rock