When Bryan Garner published the first edition of A Dictionary of Modern American Usage in 1999, the book quickly became one of the most influential style guides ever written for the English language. After four previous editions and over twenty years, our language has evolved in many ways, and the powerful tool of big data has revolutionized lexicography. This extensively revised new edition fully captures these changes, featuring a thousand new entries and over two hundred replacement entries, thoroughly updated usage data and ratios on word frequency based on the Google Ngram Viewer, a more balanced coverage of World Englishes, not just American and British, and the inclusion of gender-neutral language.