Strong's Hebrew Dictionary H5703
עַד ʻad, ad;
from H5710; 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 Translation(s):--eternity, ever(- lasting, -more), old, perpetually, + world without end.
The KJV OT Used H5703 49 Times
ever(42x),  everlasting(2x),  perpetually,  old,  evermore,  end,  eternity.
Webster's 1828 Dictionary
end, eternity, ever, everlasting, evermore, old, perpetually
Smith's 1884 Bible Dictionary