decadal

From decade + -al.

• (UK) IPA^(key): [dɪˈkeɪdəɫ]

decadal (not comparable)

1. Of or related to the number ten.
2. Of or related to a decade, in its various senses.
   • 2017, W. Hugh Woodin, In search of Ultimate-L: The 19th Midrasha Mathematicae Lectures (Version: January 30, 2017), p. 2

     About the same time in a decadal sense, there was a rather unexpected discovery.

Although decade may be taken as any group of ten years, it is commonly restricted to the informal ten-year periods of the calendar whose last digits run from 0 to 9. In such contexts, decadal refers to such calendar periods while decennial etc. refer to ten-year periods in other contexts.

• (in some contexts): See decennial

• (base-10 numeration): See decimal

From decadă +‎ -al.

decadal m or n (feminine singular decadală, masculine plural decadali, feminine/neuter plural decadale)

1. (attributive) ten days