[ dek-eyd-lawng; British also duh-keyd-lawng ]
/ ˈdɛk eɪdˌlɔŋ; British also dəˈkeɪd lɔŋ /
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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. 2021
How to use decadelong in a sentence
Those granted probationary status would not be eligible for government benefits during the decadelong wait.What You Need to Know About the Gang of Eight's Immigration Reform Deal|Justin Green|April 16, 2013|DAILY BEAST