mainline

From main +‎ line.

• IPA^(key): /ˈmeɪnˌlaɪn/

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.

• (normal, principal or standard): mainstream

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.

   Synonym: main

2. (computing, transitive) To integrate (code, etc.) into the main repository for a software project, rather than separate forks.

• mainliner
• mainlining

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.

• main line