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 being exact

n. The condition of being exact; accuracy; nicety; precision; regularity.

n. Careful observance of method and conformity to truth.

n. The state or condition of being exact; strict conformity to what is required; accuracy; nicety; precision: as, to make experiments with exactness; exactness of method.

n. the quality of being exact

"In so far as a science of geometry is possible at all, the exactness, which is its essential characteristic, is only {11} attainable by starting from data which are in themselves impossible, as of a point which has no magnitude, of a line which has no breadth, of a surface which has no thickness."

inexactness   

truth    accuracy   

strictness    accuracy    definiteness    precision   

preciseness    precision    minuteness    trueness   

accuracy    nicety    precision    regularity    exactitude   

exact   

exactitude    correctness    accuracy    clearness    thoroughness