Wordnet 3.0
NOUN (1)
1.
a set of rich and fashionable people who travel widely for pleasure;
The Collaborative International Dictionary of English v.0.48:
jet set \jet" set`\ n. [from jet plane, the conveyance used in
their travels.]
an international group of wealthy individuals who travel
frequently to international resorts. -- the group is not
organized, but membership is defined solely by frequent
travel for pleasure.
[PJC]
WordNet (r) 3.0 (2006):
jet set
n 1: a set of rich and fashionable people who travel widely for
pleasure