עַד (ʿad) is
a Hebrew noun
meaning perpetuity. It appears
51 times
in 12 books of the Hebrew Bible
(Strong's H5703).
Same Hebrew root (TWOT 1565a)
Range of meaning (TWOT 1565a)perpetuity, advancing; ancient mountains; for ever; terminus, duration, advance; eternity, ever, everlasting, evermore, old, perpetually, world without end
Full entry: Brown-Driver-Briggs and Strong's
עַדnoun, masculine: perpetuity, advancing
1.of past time: ancient mountains
2.of future time, לָעַד for ever
Strong's H5703עַד: 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:eternity, ever(-lasting, -more), old, perpetually, world without end.
Meanings: Brown-Driver-Briggs (1906) and Strong's Hebrew Dictionary (1890), public domain, via the Open Scriptures Hebrew Bible Project (CC BY 4.0). TWOT numbers for reference only.
Root family 1565: עָדָהʿādâ — pass on, advance; removing a garment; pass, continue, remove, bedeck; adorn, deck, pass by, take away