Definitions

mainline

[meyn-lahyn, -lahyn] / ˈmeɪnˌlaɪn, -ˈlaɪn /

ADJECTIVE

principal

Synonyms

STRONGEST

dominant key leading main major outstanding paramount predominant preeminent primary prime prominent

STRONG

arch capital cardinal champion chief essential first head maximum premier sovereign star superior

WEAK

controlling crowning foremost greatest highest incomparable matchless peerless prevailing second to none stellar strongest supereminent supreme transcendent unapproachable unequaled unparalleled unrivaled

Antonyms

STRONGEST

inconspicuous inessential inferior insignificant last lesser minor nonessential ordinary secondary subordinate trivial unimportant unknown

STRONG

auxiliary least lower poor

WEAK

extra

VERB

inject

Synonyms

STRONGEST

vaccinate

STRONG

inoculate jab shoot

WEAK

give a shot

Antonyms

WEAK

take out

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Technology will be rolled out across 1,400 trains on mainline nationalised services allowing them to connect to low-earth satellites, instead of mobile networks.

From BBC • May 30, 2026

The game will launch on current-generation consoles, PC and Nintendo Switch 2, marking the first mainline Call of Duty to skip PlayStation 4 and Xbox One.

From BBC • May 29, 2026

The service is installed on more than 300 of those planes but just 18 of its mainline jets.

From The Wall Street Journal • Apr. 1, 2026

The genius of hit songs, beyond technical artistry—and the vagaries of timing—is the ability to mainline emotion.

From The Wall Street Journal • Mar. 5, 2026

Black Muslims came in many stripes, from mainline Nation of Islam to the splinter Five Percenters.

From "Newjack: Guarding Sing Sing" by Ted Conover

mainline

Example Sentences

Related Words