of or pertaining to a decade.

1745–55; decade + -al1

decadally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
decade (ˈdɛkeɪd, dɪˈkeɪd)
1.  a period of ten consecutive years
2.  a group or series of ten
[C15: from Old French, from Late Latin decad-, decas, from Greek dekas, from deka ten]

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Example sentences
Perhaps a decadal survey could cogently argue for such flagship missions, but
  this last one did not.
The decadal survey committee reviewed a wealth of scientifically compelling
  medium size projects.
We are working constructively with the scientific community on their next
  decadal surveys to further improve this process.
Nor do decadal trends in temperature reflect anything but decadal trends in
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