decades-long
adjective
de·cades-long
ˈde-ˌkādz-ˌlȯŋ 
variants
or less commonly decadeslong
: lasting two or more decades : occurring over a period of two or more decades
a decades-long career
… no discussion of wolf research would be complete without mention of this fascinating, decades-long study.—
Robert R. Ream
Robert R. ReamHis decades-long accumulation of books makes an eclectic mix …—Stephen Mihm
Stephen MihmExamples of decades-long in a Sentence
Recent Examples on the Web
That program will help Historic Denver finish a decades-long project to document all 160,000 buildings in the city.
—Noelle Phillips, Denver Post, 11 Jan. 2026
But the memory of decades-long civil unrest, largely ended by a peace agreement signed in 2016, is still fresh enough to provide a real-life context for Teddy’s machinations.
—Alison Herman, Variety, 11 Jan. 2026
For the comedic pair, the project is a natural extension of their decades-long creative partnership.
—Sarah Jones, PEOPLE, 9 Jan. 2026
Ferrovial’s decades-long agreements to operate toll roads around cities, including Charlotte and Dallas-Fort Worth, now underpin 80% of its valuation, Madridejos says.
—Andrew Edgecliffe-Johnson, semafor.com, 9 Jan. 2026
See All Example Sentences for decades-long
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Noelle Phillips, Denver Post, 11 Jan. 2026
But the memory of decades-long civil unrest, largely ended by a peace agreement signed in 2016, is still fresh enough to provide a real-life context for Teddy’s machinations.
—Alison Herman, Variety, 11 Jan. 2026
For the comedic pair, the project is a natural extension of their decades-long creative partnership.
—Sarah Jones, PEOPLE, 9 Jan. 2026
Ferrovial’s decades-long agreements to operate toll roads around cities, including Charlotte and Dallas-Fort Worth, now underpin 80% of its valuation, Madridejos says.
—Andrew Edgecliffe-Johnson, semafor.com, 9 Jan. 2026
See All Example Sentences for decades-long
Cite this Entry
“Decades-long.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/decades-long. Accessed 12 Jan. 2026.
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