The Collaborative International Dictionary of English v.0.48:

Magnoliophyta \Magnoliophyta\ n.
   A class of flowering plants that produce seeds enclosed in an
   ovary; in some systems considered a class (Angiospermae) and
   in others a division (Magnoliophyta or Anthophyta).

   Syn: Angiospermae, class Angiospermae, division
        Magnoliophyta, Anthophyta, division Anthophyta.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Magnoliophyta
    n 1: comprising flowering plants that produce seeds enclosed in
         an ovary; in some systems considered a class (Angiospermae)
         and in others a division (Magnoliophyta or Anthophyta)
         [syn: Angiospermae, class Angiospermae,
         Magnoliophyta, division Magnoliophyta, Anthophyta,
         division Anthophyta]