This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The boundary line of a circle.

n. The boundary line of a figure, area, or object.

n. The length of such a boundary.

n. The line that bounds a circle or other two-dimensional figure

n. The length of such a line

n. The surface of a round or spherical object

v. To include in a circular space; to bound.

n. The line that goes round or encompasses a circular figure; a periphery.

n. A circle; anything circular.

n. The external surface of a sphere, or of any orbicular body.

v. To include in a circular space; to bound.

n. The line that bounds a circle; by extension, the bounding line of any regular plane curvilinear figure; a periphery: as, the circumference of a circle or an ellipse. The circumference of a sphere is that of a great circle of the sphere.

n. Hence Loosely, any bounding line: as, the circumference of a city.

n. The space included in a circle; anything circular in form.

n. A going about; circumlocution.

To include in a circular or spherical space.

n. the boundary line encompassing an area or object

n. the length of the closed curve of a circle

n. the size of something as given by the distance around it

"This means the circumference is about 1000 meters, so v is 1000 meters per minute, which yields a simulated gravity about 1/6 of Earth's -- the same as the moon (though the people inside move as though the gravity is Earth-normal)."

center    middle   

mete    boundary line    delimitation    borderline    border    length   

boundary   

diameter    perimeter    radius   

periphery    circle    bound    circuit    compass    round    perimeter    perimetry    girth    girt   

diameter    width    girth    radius    rim    thickness    perimeter    curvature    periphery    dimension