since
/ˈsin(t)s/
adverb
from a definite past time until now
before the present time : ago
after a time in the past : subsequently
has stayed there ever since
conjunction
at a time in the past after or later than : from the time in the past when
when
in view of the fact that : because
has held two jobs since he graduated
preposition
in the period after a specified time in the past : from a specified time in the past