WordReference Random House Learner's Dictionary of American English © 2017
de•cen•ni•al /dɪˈsɛniəl/USA pronunciation   adj. 
  1. of or for ten years;
    occurring every ten years.

n. [countable]
  1. a decennial anniversary or its celebration.
de•cen•ni•al•ly, adv. See -dec-.

WordReference Random House Unabridged Dictionary of American English © 2017
de•cen•ni•al  (di senē əl),USA pronunciation adj. 
  1. of or for ten years.
  2. occurring every ten years.

  1. a decennial anniversary.
  2. its celebration.
de•cenni•al•ly, adv. 
  • Latin decenni(um) a period of ten years (decenn(is) decennary + -ium -ium) + -al1
  • 1650–60

Collins Concise English Dictionary © HarperCollins Publishers::

decennial /dɪˈsɛnɪəl/ adj
  1. lasting for ten years
  2. occurring every ten years
  1. a tenth anniversary or its celebration

deˈcennially adv

'decennial' also found in these entries:

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