Here's what rhymes with obstipation.
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fixation frustration installation irrigation irritation medication penetration propagation quotation saturation termination vacation ventilation vibration affirmation animation authorization aviation causation cessation deprivation derivation desolation desperation dissipation fascination federation fermentation filtration litigation maturation mediation moderation modulation mutation narration ordination oscillation retardation toleration veneration vocation adjudication affectation allegation alternation amputation bifurcation castration connotation constellation consternation deportation devastation dispensation divination escalation fluctuation germination hydration imputation inhalation interpolation intimation intonation ovulation perforation perspiration punctuation recitation reparation subjugation ulceration urbanization usurpation vindication information combination explanation association circulation conversation cooperation corporation determination imagination integration legislation participation presentation translation appreciation conservation correlation cultivation declaration expectation exploitation exploration illustration immigration inflation inspiration invitation justification limitation migration modification orientation preservation realization restoration revelation stimulation acceleration accommodation alienation anticipation arbitration assimilation collaboration computation confirmation confrontation consultation deformation degeneration designation emancipation excitation implication inflammation navigation nomination precipitation reservation respiration segregation simulation speculation valuation accusation affiliation aggregation annihilation assassination attenuation calibration certification compilation consolation deliberation dislocation dissemination dissociation elaboration emigration evaporation excavation expiration fabrication graduation importation insulation ionization irradiation modernization optimization polarization privatization ratification reformation replication abbreviation augmentation authentication cancellation capitulation commendation conformation consummation coronation dehydration demarcation duplication elucidation emulation eradication exaltation exhortation exportation fertilization fibrillation hybridization implantation innervation invocation provocation refutation regurgitation renovation revocation sedimentation segmentation stipulation vaccination organization concentration consideration examination interpretation civilization evaluation investigation regulation transformation calculation compensation demonstration formulation appropriation condemnation congregation consolidation contemplation coordination depreciation deterioration elimination illumination inclination indignation initiation manifestation proclamation recreation regeneration registration rehabilitation relaxation resignation utilization amplification annexation articulation civilisation 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