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since (EN)
preposition, adverb, conjunction

preposition “since”

since
  1. refers to the period starting at a certain point in the past and continuing to a later point in the past or up to the present
    She has been living in New York since 2010.

adverb “since”

since (more/most)
  1. indicates that something happened at a particular time in the past and has not occurred again up to now
    She moved to Spain in 2010 and has lived there ever since.

conjunction “since”

since
  1. used to introduce a clause explaining the time from which an action or situation started
    She has been my best friend since we were in kindergarten.
  2. used to give a reason or explanation for something
    Since it's raining, we'll have to cancel the picnic.