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