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