עַד
`ad (ad) n-m.
1. (properly) a (peremptory) terminus
2. (by implication) duration, in the sense of advance or perpetuity (substantially as a noun, either with or without a preposition)
[from H5710]
KJV: eternity, ever(- lasting, -more), old, perpetually, + world without end.
Root(s): H5710
H5710