They've Definition & Meaning - Merriam-Webster. Definition. Word History. Entries Near. Show more. Save Word. they've. contraction. ˈt͟hāv. : they have. Word History. First Known Use. 1611, in the meaning defined above. Time Traveler. The first known use of they've was in 1611. See more words from the same year. Dictionary Entries Near they've. More @Wikipedia
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