Liddell–Scott–Jones: συνᾰρίθμ-ησις

συνᾰρίθμ-ησις,εως,ἡ,

A. counting up, enumeration, Sor. 1.21 , Gal. 10.738 , 18(2).233 , Ath. 11.490c .

II. sum of the letters of a word taken as arithmetical signs(v.ἀριθμόςX),ἡ ς. τοῦ κόσμου ὀνόματος ἑξακόσιά ἐστιAnatolius ap. Theol.Ar. 37 .