An essential guidebook for students, scientists, clinicians, and public health professionals, critically updated and revised in light of the COVID-19 pandemic and newly emerging concepts in global public health. This seventh edition of A Dictionary of Epidemiology features new and updated definitions on a wide variety of concepts, including terms that proved essential during and after the COVID-19 pandemic as well as emerging concepts on statistics and research methods. Sponsored by the International Epidemiological Association (IEA), this book remains the essential reference for anyone studying or working in epidemiology, biostatistics, public health, medicine, data sciences, or the growing number of health sciences in which epidemiologic skills are now required. More than just a dictionary, this text is an essential guidebook to the state of the science. It offers the most current, authoritative definitions of terms central to biomedical and public health literature - with updated definitions on terms from airborne infection and syndemic to real world and target trial. As epidemiology continues to change and grow, A Dictionary of Epidemiology will remain its book of record.