Here's what rhymes with incometaxation.
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gestation hydration innervation iteration perspiration perturbation punctuation vaccination information education population application association circulation conversation cooperation corporation integration preparation publication radiation adaptation compensation conservation correlation cultivation exploration immigration inspiration invitation liberation obligation preservation realization restoration revelation accommodation alteration collaboration confirmation contamination degradation delegation designation dissertation estimation hesitation imitation indignation initiation irrigation irritation medication meditation navigation negotiation nomination proclamation propagation recreation reservation respiration termination valuation vegetation affiliation annihilation approbation assassination attenuation authorization condensation consolation dedication deprivation desolation desperation dilatation dissipation dissociation elaboration emigration evaporation exaggeration 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assimilation celebration characterization computation condemnation congregation consolidation consultation continuation deformation degeneration depreciation destination emancipation frustration implication inclination inflammation installation manipulation penetration proliferation regeneration resignation segregation simulation speculation utilization ventilation calibration certification coagulation colonization compilation complication deliberation dislocation distillation evacuation fabrication fermentation generalization importation incarnation incubation irradiation litigation localization notification ordination preoccupation pronunciation ratification replication retardation alternation amputation capitulation categorization commendation conciliation confederation confiscation conflagration consecration constellation consternation constipation culmination dehydration delineation demarcation deportation deputation devaluation dispensation elongation elucidation emulation enumeration eradication exclamation exportation fertilization fibrillation immunization implantation imputation inauguration inoculation intimation intonation liquidation magnification masturbation nationalization normalization polymerization reclamation refutation relocation renunciation standardization synchronization utilisation vindication administration concentration interpretation civilization classification participation demonstration differentiation formulation orientation stimulation confrontation contemplation coordination deterioration documentation elimination illumination incorporation manifestation precipitation qualification recommendation registration specification amplification articulation civilisation clarification denomination dissemination fragmentation globalization gratification humiliation infiltration multiplication privatization purification signification socialization specialization stabilization stratification subordination unification verification 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