Here's what rhymes with definitionalism.
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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 mathematician 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 sedition envision intermission rendition cataclysm rhetorician theoretician dietitian munition prevision tactician definition competition composition television transition transmission acquisition disposition expedition repetition deposition exhibition exposition politician prohibition superstition subdivision circumcision technician dentition extradition indecision inquisition paroxysm electrician manumission premonition academician imprecision readmission recognition proposition malnutrition preposition requisition indisposition interposition presupposition superposition disquisition obstetrician pediatrician statistician superimposition decomposition juxtaposition transposition precondition redefinition diagnostician predisposition wisdom serum theorem cecum gingham system kingdom victim dictum gypsum fearsome winsome symptom pilgrim ecosystem