decennium

plural decenniums · plural decennia

1. rareSynonym of decade: a ten year period.

   Christian leaders refused even to *look* through Galileo's telescope (as a matter of fact, the Vatican cleared Galileo's name only as late as in the previous decennium).

   1996, soc.culture.usa (Usenet)

   1 more example

   G.B. still has to cope with the heritage of approx. 20 years of consecutive Conservative reigns, just as you guys are getting your act together after almost a decennium of Enlightened Ronnie.

   1998, soc.culture.netherlands (Usenet)

   Synonyms: decade