mainline

باللغة العربية: رئيسي، تقليدي

1. Normal, principal or standard.
2. Not fundamentalist, charismatic or evangelical. (US)
3. Of or pertaining to the principal route or line of a railway.
4. Of or pertaining to a surface-level heavy rail system as distinct from an underground, elevated or light rail one.
5. Of or pertaining to national or long-distance rail network operators as opposed to urban and suburban operators.
6. Pertaining to a direct route between two major ports.
7. Of a sequence of opening moves: being part of a main line ("a standard sequence of opening moves considered to be best play").