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