[dek-eyd-lawng; British also duh-keyd-lawng]
lasting for a decade: After a decadelong study, the drug has finally been approved by the FDA.
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Examples from the Web for decadelong
Contemporary Examples of decadelong
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
April 16, 2013