The GENERAL CONTEXT of such use is:
positivity:
(a) the quality, character, or fact of being positive in various senses; positiveness
(b) a positive or real thing as opposed to a mere negation; an actuality.
1681 Relig. Clerici 36 "That Immaterial, Infinite and the like, were negatives indeed in words... but properly and in themselves they were absolute positivities."
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