Here's what rhymes with deacclimation.
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illustration immigration indication inspiration invitation motivation organisation orientation preservation restoration acceleration accommodation aspiration assimilation celebration collaboration computation condemnation confrontation decoration designation destination dissertation documentation excitation fixation frustration hesitation implication initiation medication meditation navigation propagation recreation regeneration relaxation respiration saturation simulation speculation valuation vegetation vibration affiliation annexation articulation assassination attenuation authorization compilation complication condensation consolation dedication denomination deprivation desolation dissemination elaboration emigration excavation expiration fabrication federation fermentation filtration fragmentation habitation incarnation incubation insulation irradiation localization modulation polarization realisation replication retardation starvation toleration affectation amalgamation 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