vicennial

• POS: Adjective
• HYPHEN: vi=cen=ni=al

CIDE DICTIONARY

vicennial, a. [L. vicennium a period of twenty years; viceni twenty + annus year.].

•  Lasting or comprising twenty years.  [1913 Webster]
•  Happening once in twenty years; as, a vicennial celebration.  [1913 Webster]

OXFORD DICTIONARY

vicennial, adj. lasting for or occurring every twenty years.

Etymology

LL vicennium period of 20 years f. vicies 20 times f. viginti 20 + annus year

ROGET THESAURUS

vicennial

Five

N five, five, cinque, quint, quincux, six, half-a- dozen, half dozen, seven, eight, nine, three times three, dicker, ten, decade, eleven, twelve, dozen, thirteen, long dozen, baker's dozen, quintuplet, twenty, score, twenty-four, four and twenty, two dozen, twenty-five, five and twenty, quarter of a hundred, forty, two score, fifty, half a hundred, sixty, three score, seventy, three score and ten, eighty, four score, ninety, fourscore and ten, sestiad, hundred, centenary, hecatomb, century, hundredweight, cwt, one hundred and forty-four, gross, thousand, chiliad, millennium, thousand years, grand, myriad, ten thousand, ban, man, ten thousand years, banzai, lac, one hundred thousand, plum, million, thousand million, milliard, billion, trillion, five, quinary, quintuple, fifth, senary, sextuple, sixth, seventh, septuple, octuple, eighth, ninefold, ninth, tenfold, decimal, denary, decuple, tenth, eleventh, duodenary, duodenal, twelfth, in one's 'teens, thirteenth, vicesimal, vigesimal, twentieth, twenty-fourth, vicenary, vicennial, centuple, centuplicate, centennial, centenary, centurial, secular, hundredth, thousandth.