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
His decades-long accumulation of books makes an eclectic mix …—Stephen Mihm
Cite this Entry
“Decades-long.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/decades-long. Accessed 2 Sep. 2026.
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