/ Dictionary / Index V vigesimal: Meaning and Definition of Find definitions for: vi•ges•i•mal Pronunciation: (vī-jes'u-mul), [key] — adj. of, pertaining to, or based on twenty. twentieth. proceeding by twenties. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: vigesimal (Thesaurus) vigentennial vigesimo Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language