G1498 εἴην (eíēn)

KJV renderings: mean, + perish, should be, was, were
Strong's definition: might (could, would, or should) be
Derivation: optative (i.e. English subjunctive) present of G1510 (εἰμί) (including the other person);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.