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 positive; positivity

n. The result of being positive

n. The quality or state of being positive; reality; actualness; certainty; confidence; peremptoriness; dogmatism. See positive, a.

n. The state of being positive; actualness; reality of existence; not mere negation; undoubting assurance; full confidence; peremptoriness.

n. a quality or state characterized by certainty or acceptance or affirmation and dogmatic assertiveness

n. an amount greater than zero

n. the character of the positive electric pole

n. the quality of being undeniable and not worth arguing about

n. the quality of being encouraging or promising of a successful outcome

"But in the final analysis, the positive review simply in its positiveness, is displaying a passion, and therefore a reason to be passionate about whatever is reviewed, in this case, poetry, or poets."

negativeness   

amount    sign    polarity    unquestionableness    indisputability    unquestionability    indubitability   

positive   

reality    actualness    certainty    confidence    peremptoriness   

incisiveness    loudness    distinctness    complacence    manner    asperity    impassibility    celerity    anti-semite    definiteness