> I are a engineer.
>
> Is there an adjective form of the word decade? I want to describe
> something that happens only once in ten years.
"Decennial" is the word you need.
Remember that "decade" implies 10 *days* not 10 years
though many people seem to propagate the ill use :D)
BTW, you *are* an engineer but you'd better
not use the plural when alone ;-)
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