Bailly
[ῑ̆ᾰ] adv., un nombre de fois égal, PLAT.
Rsp. 546 c,
Theæt. 147 e,
148 a ; EUCL.
Elem. 7, def. 21 ; STR.
174, etc.
Étym. ἴσος, -άκις.
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LSJ
Adv. from ἴσος, the same number of times, as many times, Str. 3.5.8; ἰ. πολλαπλάσιος c. gen., the same multiple of…, Euc. 7 Def. 21, al. ; ἰ. πολλαπλάσια equimultiples, Id. 5 Def. 5, al. ; ἰ. ἴσος, of a number, equal multiplied by equal, i.e.
square, Pl. R. 546c, Tht. 147e, 148a, Euc. 7 Def. 19, Ph. 1.11, etc. ; ἰ. ἴσος ἰ.
equal multiplied by equal multiplied by equal, i.e.
cube number, Euc. 7 Def. 20, etc.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
gleichvielmal ; Plat. Theaet. 147e ; Mathem.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)