indentation

Noun

• 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)

Related words

• Synonyms: 
  indention , indent , indenture , pitting , roughness