ἀντίσωσις
From LSJ
ἵνα οὖν μηδ' ἐν τούτῳ δῷ αὐτοῖς λαβήν (Photius, Fragments on the Epistle to the Romans 483.26) → so that he doesn't give them even here a handle (= an opportunity for refutation)
English (LSJ)
[ῐς], εως, ἡ, equalization, Iamb.Protr.21. ιθ.
Spanish (DGE)
-εως, ἡ igualación Iambl.Protr.21 (p.118).