Standard Lemma guide

mainline

adj · noun · verb · 20 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /ˈmeɪnˌlaɪn/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • Australia: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: M EY1 N L AY2 N Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Normal, principal or standard.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: mainstream

Antonyms: none provided

2

adj

Meaning 2

Not fundamentalist, charismatic or evangelical.

Definition source: English Wiktionary via Wiktextract

Usage: US, not-comparable

Topics: Christianity, Protestantism, lifestyle, religion

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adj

Meaning 3

Of or pertaining to the principal route or line of a railway.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: rail-transport, railways, transport

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

adj

Meaning 4

Of or pertaining to a surface-level heavy rail system as distinct from an underground, elevated or light rail one.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: rail-transport, railways, transport

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

adj

Meaning 5

Of or pertaining to national or long-distance rail network operators as opposed to urban and suburban operators.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: rail-transport, railways, transport

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

adj

Meaning 6

Pertaining to a direct route between two major ports.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: economics, sciences, shipping, transport

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: feeder

7

adj

Meaning 7

Of a sequence of opening moves: being part of a main line ("a standard sequence of opening moves considered to be best play").

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: board-games, chess, games

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

noun

Meaning 8

An airline's main operating unit, as opposed to codeshares or regional subsidiaries.

Definition source: English Wiktionary via Wiktextract

Topics: aeronautics, aerospace, aviation, business, engineering, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

9

noun

Meaning 9

The principal route or line of a railway.

Definition source: English Wiktionary via Wiktextract

Topics: rail-transport, railways, transport

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

10

noun

Meaning 10

In longline fishing the central line to which the branch lines with baits are attached.

Definition source: English Wiktionary via Wiktextract

Topics: fishing, hobbies, lifestyle

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

11

noun

Meaning 11

The pipeline carrying wastewater to the public drains or a septic tank.

Definition source: English Wiktionary via Wiktextract

Topics: business, construction, manufacturing, plumbing

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

12

noun

Meaning 12

A principal vein into which a drug can be injected.

Definition source: English Wiktionary via Wiktextract

Usage: slang

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

13

noun

Meaning 13

The main repository for a software project, from which different versions (forks) may be split off.

Definition source: English Wiktionary via Wiktextract

Topics: computing, engineering, mathematics, natural-sciences, physical-sciences, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

14

noun

Meaning 14

Alternative form of main line.

Definition source: English Wiktionary via Wiktextract

Usage: alt-of, alternative

Topics: board-games, chess, games

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

15

noun

Meaning 15

The general population of a prison.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: genpop

Antonyms: none provided

16

verb

Meaning 16

To inject (a drug) directly into a vein.

Definition source: English Wiktionary via Wiktextract

Usage: slang

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: main

Antonyms: none provided

17

verb

Meaning 17

To consume voraciously.

Definition source: English Wiktionary via Wiktextract

Usage: broadly, informal, transitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

18

verb

Meaning 18

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

Definition source: English Wiktionary via Wiktextract

Usage: transitive

Topics: computing, engineering, mathematics, natural-sciences, physical-sciences, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

19

verb

Meaning 19

To include (a prisoner) in the general population of a prison.

Definition source: English Wiktionary via Wiktextract

Usage: transitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

20

verb

Meaning 20

inject into the vein

Definition source: Princeton WordNet 3.0

Examples

  • She is mainlining heroin

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: inject

History

Etymology

From main + line.

Across languages

Translations

9 source translations are retained for this English entry.

  • Esperanto: ĉeftendenca — normal, principal, or standard
  • Swedish: stambana — (rail transport) the principal route
  • Finnish: päärata — principal railway line
  • German: Hauptbahn — principal railway line
  • German: Haupteisenbahnstrecke — principal railway line
  • Hungarian: fővonal — principal railway line
  • Finnish: selkäsiima — fishing: central line of a longline
  • Galician: madre — fishing: central line of a longline
  • Galician: estrallo — fishing: central line of a longline
Real reading context

mainline in complete knowledge articles