`ad (Hebrew #5703)
properly, a (peremptory) terminus, i.e. (by implication) duration, in the sense of advance or perpetuity (substantially as a noun, either with or without a preposition)
KJV usage: eternity, ever(- lasting, -more), old, perpetually, + world without end.
Pronounce: ad
`owlam (Hebrew #5769)
from 5956; properly, 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
KJV usage: alway(-s), ancient (time), any more, continuance, eternal, (for, (n-))ever(-lasting, -more, of old), lasting, long (time), (of) old (time), perpetual, at any time, (beginning of the) world (+ without end). Compare 5331, 5703.
Pronounce: o-lawm'
Origin: or lolam {o-lawm'}