Definitions of race and ethnicity themselves require ongoing rethinking.

Evidence

In this environment there is a need for rethinking the ways in which race and ethnicity have been studied. At the heart of this rethinking we need to ask what it is that we mean when we use terms such as race, racism, ethnicity, and ethnocentrism. — David Theo Goldberg, John Solomos, A Companion to Racial and Ethnic Studies, 89

Categorization

• corroborated: 2 independent passages support this claim — David Theo Goldberg, John Solomos, A Companion to Racial and Ethnic Studies, 89