This document outlines the definitions of commonly used terms related to violence against women and measuring its prevalence. The terms originate from various disciplines and conceptual backgrounds, and they continue to evolve. There is no universal consensus on the terminology used in the collection of data on violence against women. Definitions of many of the most commonly used terms vary historically and culturally, and also vary among organizations and sectors, such as among healthcare providers and legal professions. Definitions also vary among researchers of different disciplines. Some terms remain sensitive and contentious. The definitions of the terms here reflect current common usage in collecting data on violence against women. Where possible we have used United Nations definitions.