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Definition of Jeffrey
1. Proper noun. (given name male from=Germanic), the usual U.S. spelling of Geoffrey. Popular in the latter half of the 20th century. ¹
2. Proper noun. (surname patronymic from=given names dot=) derived from Geoffrey. ¹
3. Noun. (slang) £20,000. ¹
¹ Source: wiktionary.com