Meaning of “since” - Learner’s Dictionary

since

conjunction us uk /sɪns/
Extra Examples
I haven't had a decent cup of coffee since I've been here.The room looks very different since you've changed the furniture around.His confidence has grown immeasurably since he got the job.Road deaths have levelled off since the speed limit was lowered.The Princess hasn't appeared in public since her divorce was announced.
TIME

B1 from a time in the past until a later time or until now:

He's been much happier since he started his new job.
I've known Tim since he was seven.
BECAUSE

B1 because:

He drove quite slowly since we had plenty of time.

(Definition of “since conjunction” from the Cambridge Learner’s Dictionary © Cambridge University Press)