The Correct and Preferred Usage chapter of the 11th edition of the AMA Manual of Style includes a large glossary of frequently misused or confused terms. In addition to this updated and cross-referenced glossary, additional examples illustrate other usage problems, such as redundant, expendable, and incomparable words and phrases; jargon; and back-formations. Specific advice is provided on describing the administration of drugs, age and sex referents, anatomy, clock referents, laboratory values, and articles before abbreviations and acronyms and before the aspirate h and nonvocalicy. Guidance is also provided on inclusive language (eg, sex/gender, presenting data in tables, personal pronouns, sexual orientation, race/ethnicity, age, socioeconomic status, and terminology for persons with diseases, disorders, or disabilities). New to this edition is a discussion of spelling and spacing variations, with preferences of the JAMA Network journals indicated.