English Reference

Word

longtime

Phoneticslong·time, stress on the first syllable

US/ˈɫɔŋˌtaɪm/

UK/lˈɒŋtaɪm/

Definitions

01lasting for many years

B2 · Upper Intermediate

adj. describing someone or something that has been in a certain state for a long time.

adj. having existed or persisted for a significant period. Almost exclusively used as an attributive adjective before the noun.

“The two women were longtime friends who met in primary school.”

“The senator's longtime advisor resigned yesterday, ending a professional partnership that had spanned three decades of political campaigning.”

Usage

Usually placed immediately before the noun it modifies.

Pitfall

They have been longtime together.

They have been together for a long time.

Use 'longtime' as an adjective before a noun (longtime friends), not as an adverbial phrase at the end of a sentence.

Synonyms

enduringlifelonglong-standing

Antonyms

02for a long duration

C2 · Proficiency Informal · Dialect

adv. for a long time.

adv. for a long period of time. This adverbial use is less common than the adjective and often appears in specific dialects or informal contexts.

“I haven't seen him longtime.”

“The locals claim that the old mill has stood empty longtime, though records suggest it was operational until the late nineties.”

Usage

Often functions as a shortened form of 'for a long time' in casual speech.

Synonyms

Collocations

Common phrases and expressions where native English speakers use the word “longtime” in context.

01. longtime friend

Real-World Examples

“His longtime OHSU colleague and coauthor Nancy Haigwood, Ph.D., believed that pairing leronlimab with existing HIV therapies could prove more effective.”
ScienceDaily 13 Aug 2026
“To advertise these products, he asked Patti Serrano , longtime friend and business partner, to drive up and down the West Coast and knock on people’s doors.”
Smithsonian Magazine 12 Aug 2026

Etymology

From long + time.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Word family

ADJECTIVE

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944EikenEikenTest in Practical English ProficiencyThe English proficiency test from the Eiken Foundation of Japan, widely taken by Japanese students. Grades run from 5 to 1, with Pre-1 and Pre-2 between them.Pre-1
Frequency
Frequent
Level
B2 · Upper Intermediate
Updated

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