The Collaborative International Dictionary of English v.0.48:

Pedant \Ped"ant\, n. [F. p['e]dant, It. pedante, fr. Gr.
   paidey`ein to instruct, from pai^s boy. See Pedagogue.]
   1. A schoolmaster; a pedagogue. [Obs.] --Dryden.
      [1913 Webster]

            A pedant that keeps a school i'th' church. --Shak.
      [1913 Webster]

   2. One who puts on an air of learning; one who makes a vain
      display of learning; a pretender to superior knowledge.
      --Addison.
      [1913 Webster]

            A scholar, yet surely no pedant, was he.
                                                  --Goldsmith.
      [1913 Webster] Pedantic

WordNet (r) 3.0 (2006):

pedant
    n 1: a person who pays more attention to formal rules and book
         learning than they merit [syn: pedant, bookworm,
         scholastic]