עֵילוֹם ʻêylôwm (H5865)

{concealed, i.e. the vanishing point; generally, time out of mind (past or future), i.e. (practically) eternity; frequentatively, adverbial (especially with prepositional prefix) always}

1) for ever, ever, everlasting, evermore, perpetual, old, ancient, world

for עוֹלָם (H5769)