Wordnet 3.0
NOUN (1)
1.
the century from 1901 to 2000;
WordNet (r) 3.0 (2006):
twentieth century
n 1: the century from 1901 to 2000
Moby Thesaurus II by Grady Ward, 1.0:
25 Moby Thesaurus words for "twentieth century":
a la mode, advanced, avant-garde, contemporary, far out,
fashionable, forward-looking, in, mod, modern, modernistic,
modernized, modish, newfashioned, now, present-day, present-time,
progressive, streamlined, ultra-ultra, ultramodern, up-to-date,
up-to-datish, up-to-the-minute, way out