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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.

In the 2025 spending review, the Department of Transport secured £41m to introduce low earth orbit satellite connectivity on all mainline trains by 2030.

From BBC • Nov. 16, 2025

With that guidance, officials canceled plans to transfer most of the inmates to mainline prisons.

From The Wall Street Journal • Oct. 11, 2025

On being told of Tilly’s existence by an interviewer for Variety, “Please stop,” she insisted, while demanding that mainline studios and talent agencies refrain from trafficking with AI actresses.

From The Wall Street Journal • Oct. 10, 2025

He used to present as a staid mainline Episcopalian, but now he denounces that church and speaks of being “mauled by demons.”

From Salon • May 19, 2025

Meanwhile, evangelical Protestants are pulling closer to their mainline counterparts in class and education.

From "Class Matters" by The New York Times