Here's what rhymes with occacasion.
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cooperation corporation foundation integration observation publication radiation regulation separation variation adaptation admiration conservation cultivation declaration deviation inflation liberation modification motivation realization revelation sensation alienation alteration aspiration assimilation collaboration confirmation congregation degradation designation dissertation domination estimation excitation hesitation implication inclination irritation meditation nomination plantation propagation recreation relaxation reservation resignation saturation temptation valuation vegetation vibration affiliation annexation approbation assassination authorization calibration certification compilation complication consolation derivation desolation dilatation excavation expiration fascination federation graduation habitation insulation maturation mediation moderation modulation mutation notification ordination probation ratification reformation replication signification starvation toleration unification validation veneration verification affectation alternation amalgamation cancellation commendation confiscation conformation consecration consummation culmination demarcation divination elongation emulation eradication fluctuation germination gestation hydration innervation intimation intonation ovulation perforation perturbation provocation punctuation recitation reclamation relocation renovation reparation sanitation urbanization usurpation vindication visitation organization population communication consideration examination explanation classification imagination legislation preparation reputation translation accumulation appreciation calculation compensation configuration expectation exploration illustration inspiration invitation justification limitation organisation preservation restoration acceleration anticipation approximation celebration computation condemnation consultation coordination destination elimination frustration illumination indignation inflammation initiation installation negotiation penetration proclamation qualification respiration simulation speculation utilization ventilation amplification attenuation clarification coagulation colonization condensation deprivation desperation dislocation dissipation distillation elaboration evacuation evaporation exaggeration fabrication fermentation filtration gratification incarnation incubation intoxication irradiation localization mobilization modernization optimization polarization purification realisation retardation sophistication abbreviation amputation augmentation authentication calcification capitulation categorization conciliation confederation conflagration constellation consternation constipation deputation devastation duplication elucidation enumeration exaltation exclamation exhortation gravitation imputation inauguration inoculation interpolation interrogation liquidation magnification masturbation mortification perspiration prolongation regurgitation segmentation concentration civilization determination evaluation identification investigation participation presentation exploitation formulation orientation stimulation appropriation arbitration characterization confrontation consolidation contamination contemplation continuation deformation degeneration emancipation incorporation manipulation recommendation regeneration articulation civilisation deliberation denomination dissemination dissociation fragmentation globalization importation multiplication preoccupation privatization retaliation socialization specialization stabilization stratification subordination dehydration delineation denunciation deportation deregulation dispensation diversification exportation extermination fertilization fibrillation hybridization immunization implantation inactivation magnetization personification quantification refutation renunciation resuscitation sedimentation sterilization stipulation utilisation visualization transformation demonstration differentiation discrimination transportation depreciation deterioration documentation manifestation proliferation reconciliation registration rehabilitation specification disintegration generalization humiliation infiltration liberalization pronunciation remuneration reorganization argumentation capitalization crystallization devaluation intensification intimidation menstruation nationalization normalization ornamentation polymerization rationalization refrigeration repudiation simplification standardization supplementation synchronization administration interpretation representation implementation precipitation centralization democratization excommunication hospitalization experimentation transplantation instrumentation industrialization conceptualization decentralization misrepresentation taken pagan shaken awaken bacon laden maiden layman laymen shaman patron contagion undertaken salesman overtaken straighten mistaken statesman forsaken tradesmen