10 letters · 17 points in Scrabble
noun the form of empiricism that bases all knowledge on perceptual experience (not on intuition or revelation)
noun a quality or state characterized by certainty or acceptance or affirmation and dogmatic assertiveness
originBorrowed from French positivisme, from positif (“positive”). By surface analysis, positiv(e) + -ism.
Etymology from Wiktionary, CC BY-SA 3.0