A suffix in the word êphalak “far away”, a derivative of êphal “far” (SD/247). Some authors have suggested that -ak is an intensive suffix “very” instead of suffix meaning “away” (LGtAG, NBA/32). However, the corresponding Quenya word vahai(y)a “far away” is a combination va “(away) from” and haiya “far”, so it seems to me that the literal translation “away” is more likely to be correct (this translation of va was published after LGtAG and NBA were written).
* -akpreposition. away