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Decenarian maths are places of work and study for Avout who have vowed to remain inside for a ten-year interval. Apert for a Decenarian math occurs once every decade and is the time when most Avout join or leave the math.
"Tenner" is a slang term for both the Decenarian math itself and for for an Avout belonging to one.
Most of the avout protagonists of Anathem are Decenarians, Erasmas included.