The Collaborative International Dictionary of English v.0.48:

Namely \Name"ly\, adv.
   1. By name; by particular mention; specifically; especially;
      expressly. [Obs.] --Chaucer.
      [1913 Webster]

            The solitariness of man . . . God hath namely and
            principally ordered to prevent by marriage.
                                                  --Milton.
      [1913 Webster]

   2. That is to say; to wit; videlicet; -- introducing a
      particular or specific designation.
      [1913 Webster]

            For the excellency of the soul, namely, its power of
            divining dreams; that several such divinations have
            been made, none can question.         --Addison.
      [1913 Webster]

WordNet (r) 3.0 (2006):

namely
    adv 1: as follows [syn: namely, viz., that is to say, to
           wit, videlicet]