Mainline

Adjective

  • (rail transport) Of or pertaining to the principal route or line of a railway.
  • normal, principal or standard.
  • (rail transport) Of or pertaining to a surface railway as distinct from an underground, elevated or light rail one.

Noun

  • (computing) The main repository for a software project, from which different versions (forks) may be split off.
  • (aviation) An airline's main operating unit, as opposed to codeshares or regional subsidiaries.

Verb

  • To inject (a drug) directly into a vein.

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