1. lasting for or spanning a period of ten years
Usage: typically hyphenated when used attributively (before a noun); can also appear as 'decadelong' (one word) or 'decade long' (two words)

Examples

• The decade-long drought devastated the region's agriculture.
• After a decade-long investigation, the case was finally closed.
• The company's decade-long partnership with the nonprofit made a real difference.
• She embarked on a decade-long journey to master the craft.
• The decade-long conflict between the two nations finally ended in peace.
• His decade-long career in professional sports earned him numerous awards.