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