indentation in WordNet English dictionary

1. the space left between the margin and the start of an indented line
   indentation  indention  indent  indenture 
   
2. the act of cutting into an edge with toothlike notches or angular incisions
   indentation 
   
3. the formation of small pits in a surface as a consequence of corrosion
   pitting  roughness  indentation 
   
4. a concave cut into a surface or edge (as in a coastline)
   indentation  indenture