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 state of two or more things existing together, usually in a temporal or spacial sense, with or without mutual interaction

n. Existence at the same time with another; -- contemporary existence.

n. Existence at the same time; contemporary existence.

n. In logic, that reciprocal relation which subsists between any two objects in that they exist in the same universe, generally regardless of time.

n. existing peacefully together

"The term coexistence, as it is used at the present time, implies a willingness to live at peace, and perhaps even in mutual respect, with others."

being    beingness    existence   

assistance    consistence    distance    existence    insistence    outdistance    persistence    resistance    resistence    subsistence   

simultaneousness    noctis    intermingling    repatriation    dimensionality    society    equipoise    cooeperation    concord    non-proliferation