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