English

Adjective

mainline ‎(not comparable)

1. Normal, principal or standard.
   • 2010, Steven M. Studebaker, Pentecostalism and Globalization

     At a time when mainline denominations are engaged in massive closures of small rural churches, independent charismatics are strategically helping to rechurch rural Canada.

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

Synonyms

• (normal, principal or standard): mainstream

Verb

mainline ‎(third-person singular simple present mainlines, present participle mainlining, simple past and past participle mainlined)

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

Derived terms

• mainliner
• mainlining

Noun

mainline ‎(plural mainlines)

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

See also

• main line