since

/ˈsin(t)s/

Middle English sins, contraction of sithens, from sithen, from Old English siththan, from sīth tham after that, from sīth after, late + tham, dative of thæt that; akin to Old High German sīd later and perhaps to Latin setius to a lesser degree

adverb

  1. from a definite past time until now

  2. before the present time : ago

  3. after a time in the past : subsequently

has stayed there ever since

conjunction

  1. at a time in the past after or later than : from the time in the past when

  2. when

  3. in view of the fact that : because

has held two jobs since he graduated

preposition

  1. in the period after a specified time in the past : from a specified time in the past