Probably from eido (through the idea of seeming); similar (in amount and kind) -- + agree, as much, equal, like.

see GREEK eido

ἴσα (isa) − 3 Occurrences

ἴσαι (isai) − 1 Occurrence

ἴση (isē) − 1 Occurrence

ἴσην (isēn) − 1 Occurrence

ἴσον (ison) − 1 Occurrence

ἴσους (isous) − 1 Occurrence