multidecade

From multi- +‎ decade.

multidecade (not comparable)

1. Extending over multiple decades.
   • 2009 January 22, Julia Werdigier, Nelson D. Schwartz, “The Falling Pound Raises Fears of Nationalization”, in The New York Times‎^[1], archived from the original on 6 February 2012:

     With the pound at a multidecade low and British banks requiring ever-larger injections of taxpayer cash, it is no wonder that observers have started to refer to London as “Reykjavik-on-Thames.”

• decadeslong

• multiday, multiweek, multimonth, multiyear

• decadelong, perennial, yearlong, yearslong

• demucilated