decadelong

or dec·ade-long

[ dek-eyd-lawng; British also duh-keyd-lawng ]
/ ˈdɛk eɪdˌlɔŋ; British also dəˈkeɪd lɔŋ /

adjective

lasting for a decade: After a decadelong study, the drug has finally been approved by the FDA.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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