Greek word
híleōs
ἵλεως
What it means
cheerful, i.e. propitious
cheerful (as attractive), i.e. propitious; adverbially (by Hebraism) God be gracious!, i.e. (in averting some calamity) far be it
Where it comes from
perhaps from the alternate form of hairéomai (αἱρέομαι)