1275–1325; Middle English bi cause by cause
1. Because, as, since, for, inasmuch as
agree in implying a reason for an occurrence or action. Because
introduces a direct reason: I was sleeping because I was tired. As
are so casual as to imply merely circumstances attendant on the main statement: As
) I was tired, I was sleeping.
The reason, proof, or justification introduced by for
is like an afterthought or a parenthetical statement: I was sleeping, for I was tired. Inasmuch as
implies concession; the main statement is true in view of the circumstances introduced by this conjunction: Inasmuch as I was tired, it seemed best to sleep.