Here's what rhymes with deactivation.
nation station activation cessation gestation aeration deflation elation duration cultivation deviation inflation innovation sensation taxation dissertation fixation temptation vacation accusation aviation causation dissipation narration vocation bifurcation citation divination donation inactivation innervation iteration oration perforation sedation summation abdication aggravation amortization dictation information education operation relation situation creation formation generation foundation location observation occupation separation variation admiration elevation inspiration invitation isolation liberation motivation rotation salvation violation agitation anticipation arbitration aspiration decoration imitation initiation irrigation irritation notation oxidation quotation saturation vibration affirmation aggregation annexation derivation desolation desperation dilatation dislocation dissociation distillation evaporation federation insulation negation oscillation probation 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civilization determination imagination integration participation presentation regulation reputation calculation differentiation exploitation justification modification orientation stimulation transportation accommodation alienation approximation assimilation celebration characterization collaboration computation condemnation congregation consultation continuation coordination degradation deterioration elimination emancipation frustration illumination implication inclination manifestation nomination penetration precipitation recreation regeneration resignation segregation simulation specification utilization ventilation amplification annihilation articulation assassination attenuation calibration certification civilisation coagulation complication denomination emigration evacuation fermentation generalization gratification importation incarnation incubation infiltration localization mobilization modernization notification optimization privatization ratification replication retaliation 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