Definitions of footprint
the effect that human activity has on the environment; the effect that something has on a geographical area or on an area of activity
This will reduce the transportation sector's environmental footprint by offsetting diesel fuel usage in compression ignition engines.
the mark left on a surface by a person's bare foot, shoe or other footwear
The recent jury's statement included a reference to the footprint evidence as one indicator of guilt.
the shape of the foundation (=base) of a building
The footprint of the building has been enlarged to allow for an additional 12 apartments.