WordReference Random House Learner's Dictionary of American English © 2026
cor•rob•o•rate /kəˈrɑbəˌreɪt/USA pronunciation   v. [+ object], -rat•ed, -rat•ing. 
  1. to support by giving proof; confirm: corroborated my account of the accident.
cor•rob•o•ra•tion /kəˌrɑbəˈreɪʃən/USA pronunciation  n. [uncountable]The police are looking for corroboration of your statement.
cor•rob•o•ra•tive /kəˈrɑbəˌreɪtɪv, -ərətɪv/USA pronunciation  cor•rob•o•ra•to•ry /kəˈrɑbərəˌtɔri/USA pronunciation  adj.: corroborative testimony.

WordReference Random House Unabridged Dictionary of American English © 2026
cor•rob•o•rate  (v. kə robə rāt′;adj. kə robər it),USA pronunciation v., -rat•ed, -rat•ing, adj. 
v.t. 
  1. to make more certain;
    confirm:He corroborated my account of the accident.

adj. 
  1. [Archaic.]confirmed.
  • Latin corrōborātus past participle of corrōborāre to strengthen, equivalent. to cor- cor- + rōbor(āre) to make strong (derivative of rōbor, rōbur oak (hence, strength); see robust) + -ātus -ate1
  • 1520–30
cor•rob•o•ra•tive  (kə robə rā′tiv, -ər ə tiv),USA pronunciation cor•robo•ra•to′ry, adj.  cor•robo•ra′tive•ly, cor•robo•ra•to′ri•ly, adv. 
cor•robo•ra′tor, n. 
    1. verify, authenticate, support, validate.

Collins Concise English Dictionary © HarperCollins Publishers::
corroborate vb /kəˈrɒbəˌreɪt/
  1. (transitive) to confirm or support (facts, opinions, etc), esp by providing fresh evidence
Etymology: 16th Century: from Latin corrōborāre to invigorate, from rōborāre to make strong, from rōbur strength, literally: oakcorˌroboˈration n corroborative /kəˈrɒbərətɪv/, corˈroboˌratory adj corˈroboratively adv corˈroboˌrator n
'corroboratory' also found in these entries (note: many are not synonyms or translations):

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