Here's what rhymes with modulationdemodulation.
modulation appellation adulation nation duration imagination agitation oscillation automation interpolation oration ablation aeration dilation elation education operation population relation application creation location observation station activation adaptation admiration correlation isolation motivation obligation rotation salvation taxation violation allocation installation medication meditation navigation nomination penetration ventilation affirmation animation approbation compilation denomination desolation habitation maturation moderation narration negation ordination starvation toleration aberration adoration allegation alternation damnation donation emulation eradication inhalation inoculation intonation masturbation perturbation sedation summation ulceration annotation coloration combination formation generation circulation determination integration legislation occupation publication radiation translation variation declaration deviation elevation immigration indication inflation innovation liberation migration modification revelation alteration arbitration aspiration decoration delegation destination dissertation domination emancipation estimation imitation irrigation irritation notation oxidation plantation propagation saturation temptation termination vacation valuation vegetation vibration accusation affiliation aggregation annihilation authorization aviation calibration causation cessation consolation dedication derivation dilatation distillation elaboration emigration evaporation fascination insulation litigation mediation mobilization modernization mutation probation retardation validation vocation amputation bifurcation cancellation castration citation connotation constellation coronation demarcation denunciation divination escalation fertilization germination gestation hydration inactivation inauguration intimation iteration ovulation perforation regurgitation reparation sanitation stagnation subjugation urbanization vindication information situation examination explanation interpretation association conversation cooperation corporation evaluation foundation investigation preparation regulation reputation separation appreciation calculation compensation conservation cultivation demonstration exploration formulation illustration inspiration limitation preservation realization restoration sensation stimulation transportation acceleration accommodation alienation assimilation celebration collaboration computation condemnation confirmation consultation contemplation coordination deformation degradation designation elimination fixation frustration hesitation illumination implication inclination incorporation inflammation initiation manipulation quotation recreation reservation respiration simulation speculation utilization annexation articulation assassination attenuation certification coagulation complication condensation deliberation deprivation desperation disintegration dislocation dissemination dissipation evacuation exaggeration excavation expiration fabrication federation fermentation filtration generalization graduation importation incarnation intoxication ionization irradiation multiplication notification optimization polarization ratification realisation reformation replication retaliation veneration abbreviation adjudication affectation amalgamation authentication capitulation commendation conformation consecration consternation constipation consummation culmination dehydration delineation democratization deportation deputation devaluation devastation elongation elucidation enumeration exportation fibrillation implantation imputation innervation interrogation invocation magnetization menstruation mortification normalization perspiration prolongation provocation punctuation recitation relocation renovation renunciation revocation stipulation usurpation utilisation visitation organization concentration civilization identification participation presentation transformation accumulation expectation exploitation invitation justification organisation orientation anticipation appropriation congregation consolidation contamination degeneration depreciation deterioration excitation indignation manifestation negotiation precipitation proclamation proliferation regeneration registration relaxation resignation segregation amplification civilisation colonization dissociation globalization gratification incubation infiltration localization preoccupation privatization pronunciation remuneration socialization specialization stabilization subordination unification verification augmentation capitalization categorization centralization conciliation confiscation conflagration deregulation dispensation duplication exaltation exclamation exhortation extermination fluctuation gravitation immunization intensification intimidation liquidation magnification nationalization polymerization reclamation refutation resuscitation sterilization vaccination administration communication 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