Answer:
I am partially baked. I am not completely lit. I am a portion of the moon. I am lesser than full wit. I am a divider of the hour. I am not a total lie. I am a sibling through one parent.
There is one in every corner and two in every room.
What comes with your car, but travels more than your car?
What flies forever, rests never?
What falls down but is never injured?
What language does a billboard speak?