The Collaborative International Dictionary of English v.0.48:

Concede \Con*cede"\ (k[o^]n*s[=e]d"), v. t. [imp. & p. p.
   Conceded; p. pr. & vb. n. Conceding.] [L. concedere,
   concessum; con- + cedere to go along, give way, yield: cf. F.
   conc['e]der. See Cede.]
   1. To yield or suffer; to surrender; to grant; as, to concede
      the point in question. --Boyle.
      [1913 Webster]

   2. To grant, as a right or privilege; to make concession of.
      [1913 Webster]

   3. To admit to be true; to acknowledge.
      [1913 Webster]

            We concede that their citizens were those who lived
            under different forms.                --Burke.

   Syn: To grant; allow; admit; yield; surrender.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

conceded \conceded\ adj. prenom.
   acknowledged. Opposite of unacknowledged.

   Syn: admitted(prenominal), avowed(prenominal),
        confessed(prenominal), self-confessed(prenominal).
        [WordNet 1.5 +PJC]