From WordNet (r) 3.0 (2006):
vi
adj 1: denoting a quantity consisting of six items or units
[syn: six, 6, vi, half dozen, half-dozen]
n 1: the cardinal number that is the sum of five and one [syn:
six, 6, VI, sixer, sise, Captain Hicks, half a
dozen, sextet, sestet, sextuplet, hexad]
2: more than 130 southeastern Virgin Islands; a dependent
territory of the United States [syn: United States Virgin
Islands, American Virgin Islands, VI]