mainline
/ˈmeɪnˌlaɪn/ noun C2- An airline's main operating unit, as opposed to codeshares or regional subsidiaries.
- The principal route or line of a railway.
- In longline fishing the central line to which the branch lines with baits are attached.
- The pipeline carrying wastewater to the public drains or a septic tank.
- A principal vein into which a drug can be injected.
- The main repository for a software project, from which different versions (forks) may be split off.
- The general population of a prison.
Plural mainlines
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