WordReference Random House Learner's Dictionary of American English © 2017
cen•ten•ni•al /sɛnˈtɛniəl/USA pronunciation   adj. 
  1. of, relating to, or marking a 100th anniversary.
  2. lasting 100 years.

n. [countable]
  1. a 100th anniversary or its celebration.
cen•ten•ni•al•ly, adv. See -cent-.

WordReference Random House Unabridged Dictionary of American English © 2017
cen•ten•ni•al  (sen tenē əl),USA pronunciation adj. 
  1. pertaining to, or marking the completion of, a period of 100 years.
  2. pertaining to a 100th anniversary.
  3. lasting 100 years.
  4. 100 years old.

  1. a 100th anniversary or its celebration;
cen•tenni•al•ly, adv. 
  • Latin cent- 100 (see cent) + English -ennial pertaining to a period of years (extracted from biennial)
  • 1790–1800

Collins Concise English Dictionary © HarperCollins Publishers::

centennial /sɛnˈtɛnɪəl/ adj
  1. relating to, lasting for, or completing a period of 100 years
  2. occurring every 100 years
  1. chiefly US Canadian
    another name for centenary
Etymology: 18th Century: from Latin centum hundred, on the model of biennial

'centennial' also found in these entries:

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