εἰ
ei
i
a primary particle of conditionality; if, whether, that, etc.. Often used in connection or composition with other particles, especially as in εἴγε, εἰ δὲ μή(γε), εἰ καί, εἰ μή, εἰ μή τι, εἴ περ, εἴ πως, εἴ τις, ἐκ. See also ἐάν.

KJV translates as: forasmuch as, if, that, (al)though, whether