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 or quality of being serene.

n. The state of being serene; calmness; peacefulness.

n. A lack of agitation or disturbance.

n. A title given to a reigning prince or similar dignitary.

n. The quality or state of being serene; clearness and calmness; quietness; stillness; peace.

n. Calmness of mind; eveness of temper; undisturbed state; coolness; composure.

n. The quality or condition of being serene; clearness; calmness; quietness; stillness; peace: as, the serenity of the air or sky.

n. Calmness of mind; tranquillity of temper; placidity.

n. A title of dignity or courtesy given to certain princes and high dignitaries. It is an approximate translation of the German Durchlaucht, more commonly rendered Serene Highness. See serene, 3.

n. the absence of mental stress or anxiety

n. a disposition free from stress or emotion

"But, suffice it to say, it had something to do with the word serenity."

tranquillity    quietness    tranquility    quietude   

quietness    stillness    peace    coolness    composure    clearness    calm    calmness    sereneness   

amenity    identity   

calmness    tranquillity    contentment    cheerfulness    gentleness    repose    sweetness    equanimity    firmness    resignation