Here's what rhymes with positivism.
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decision division vision rhythm arisen risen fission mizzen given position listen mission prison emission incision excision subdivision supposition apposition envision riven stiffen prevision rescission addition opposition driven edition permission physician provision admission petition precision supervision revision submission forgiven ignition omission tuition attrition derision fruition sedition technician volition dentition imprison indecision striven audition glisten definition tradition commission television transition algorithm ambition disposition suspicion abolition collision deposition inhibition intuition partition superstition clinician imposition musician remission apparition juxtaposition magician preposition logarithm paroxysm patrician presupposition rendition superposition disquisition logician academician dietitian ebullition tactician condition composition transmission acquisition proposition repetition coalition cognition decomposition exhibition exposition nutrition politician prohibition admonition circumcision demolition erudition mathematician contrition inquisition intermission interposition cataclysm obstetrician premonition rhetorician statistician theoretician imprecision munition readmission competition expedition ammunition requisition transposition indisposition redefinition electrician manumission pediatrician superimposition recognition malnutrition predisposition extradition precondition diagnostician serum theorem cecum system wisdom victim fearsome gingham kingdom symptom dictum gypsum winsome pilgrim ecosystem