WordNet sense 1 (comprising seed plants that produce an embryo with a single cotyledon and parallel-veined leaves: includes grasses and lilies and palms and orchids; divided into four subclasses or superorders: Alismatidae; Arecidae; Commelinidae; and Liliidae):

Liliopsida, Monocotyledonae, Monocotyledones, class Liliopsida, class Monocotyledones