LSJπροσσώρ-ευσιςGlosspiling upπροσσώρ-ευσις,εως,ἡ,A. piling up: in Arith., name for theseries1 + 2 + 3 + 4 , Nicom. Ar. 2.8 .References1234Nicom. Ar. 2.8