This document provides working definitions and conceptual issues around the terms ethnicity, race, and nationality. It discusses ethnicity as referring to a culturally distinctive group that may overlap with a political group. Race is defined as a socio-culturally constructed category based on shared physical characteristics. Nationality refers to a political community with symbolic boundaries rooted in a common ethnicity, identity, and culture. The document also examines how these terms are used and defined for census and government statistics.