cor·rob·o·rate 
(kə-rŏbə-rāt′)
(kə-rŏbə-rāt′)tr.v. cor·rob·o·rat·ed, cor·rob·o·rat·ing, cor·rob·o·rates
To strengthen or support with other evidence; make more certain. See Synonyms at confirm.
[Latin corrōborāre, corrōborāt- : com-, com- + rōborāre, to strengthen (from rōbur, rōbor-, strength; see reudh- in the Appendix of Indo-European roots).]
cor·rob′o·ration n.
cor·robo·ra′tive (-ə-rā′tĭv, -ər-ə-tĭv), cor·robo·ra·to′ry (-ər-ə-tôr′ē) adj.
cor·robo·ra′tor n.