Definition: Because; since.
For another definition: Used in English to indicate that something happens during the time when something is taking place.
In ASL, use raised eyebrows (symbol /\)usually for the second clause in the beginning of a sentence.
For example, "Fred watched him as he ambled through the crowd." In ASL, "/\CROWD/\ IX2 AMBLE CL:1-through-crowd, IX1 LOOK-panning.
English: "Mary looked up as he entered the room." ASL: "ROOM/\, IX1 /\ENTER/\, MARY LOOK-UP.