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 quality of being even.

n. The state of being ven, level, or disturbed; smoothness; horizontal position; uniformity; impartiality; calmness; equanimity; appropriate place or level.

n. The state of being even, level, or smooth; equality of surface: as, the evenness of the ground; the evenness of a fluid at rest.

n. Uniformity; regularity; equality: as, evenness of motion.

n. Equal distance from either extreme; freedom from inclination to either side; impartiality.

n. Calmness; equality of temper; freedom from perturbation; equanimity.

n. the parity of even numbers (divisible by two)

n. a quality of uniformity and lack of variation

n. the quality of being balanced

"But the research by Crowder, an insect ecologist at Washington State University in Pullman, and his colleagues, shows the importance of 'evenness' - the relative abundance of different species."

parity    equality   

smoothness    uniformity    impartiality    calmness    equanimity   

steadiness    sureness    suavity    easiness    fluency