Answer:

perimeter

Answer	Crossword Clue
PERIMETER	Circumference.
PERIMETER	Outer boundaries.
PERIMETER	Outer boundary of an area.

PERIMETER	Outer boundary.
PERIMETER	Outer limits.
PERIMETER	Outer boundary
PERIMETER	Circumference
PERIMETER	Outer border
PERIMETER	Outermost limits
PERIMETER	Patrol area
PERIMETER	Frost included in novelist Benchley's outline (9)