Hebrew word
ʻad
ad
עַד
What it means
properly, a terminus, i.e. duration, in the sense of advance or perpetuity
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)
Where it comes from
from ʻâdâh (עָדָה)