until (the point when), even if / even though, if not / otherwise, on condition that / provided that, unless.
Conditional Particles
→ حتى إذا (the point when) until / when / once - even if / even thoug - even if / even though → وإنْ / ولو / حتى وإنْ / حتى لو / وإنْ كان otherwise / if not → إلّا / وإلّا فـ provided that / on condition that → على أنْ unless → إلّا إذا
إلّا / وإلّا فـ