“…Definitions convey concepts that foster common understanding among the members of the profession. Despite a number of consensus documents on health education and health promotion terminology (Joint Committee on Health Education and Promotion Terminology, 2002; Taub, Allegrante, Barry, & Sakagami, 2009; World Health Organization [WHO], 2009) and the efforts of textbook authors (Green & Kreuter, 2005; Bartholomew, Parcel, Kok, & Gottlieb, 2011; Simons-Morton, Greene, & Gottlieb, 1995; Simons-Morton, McLeroy, & Wendel, 2011), there remains considerable variability in how some key terms are employed and the meanings they convey. The purpose of this commentary is to suggest definitions for key terms that are used variably in health promotion, with a particular focus on the term health behavior .…”