in·den·ta·tion 
(ĭn′dĕn-tāshən)
(ĭn′dĕn-tāshən)n.
1.
a. The act of indenting.
b. The condition of being indented.
2. The blank space between a margin and the beginning of an indented line.
3. A notch or jagged cut in an edge.
4. A recess, as in a border or coastline.