An Universal Etymological English Dictionary was a dictionary compiled by Nathan Bailey (or Nathaniel Bailey) and first published in London in 1721. It was the most popular English dictionary of the eighteenth century. As an indicator of its popularity it reached its 20th edition in 1763 and its 27th edition in 1794. Its last edition (30th) was in 1802. It was a little over 900 pages long. In compiling his dictionary, Bailey borrowed greatly from John Kersey's Dictionarium Anglo-Britannicum (1706), which in turn drew from the later editions of Edward Phillips's The New World of English Words. Like Kersey's dictionary, Bailey's dictionary was one of the first monolingual English dictionaries to focus on defining words in common usage, rather than just difficult words.