eternity, ever(- lasting, -more), old, perpetually, + world without end

Strong’s Dictionary of Hebrew Words:

Transliteration:
`ad
Phonic:
ad
Meaning:
from 5710; 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