since since /sɪns/

conjunction

1. () For the reason that; on account of  ( cuz [Informal, Non-standard] , cos [Informal, British] , coz [Informal, British] , as , because , for , since )
   for the reason that; on account of
   

preposition

1. () Starting from a specific time or date.  ( as of , since )
   Starting from a specific time or date.