Wiktionary
n. A feminist sociological methodology of studying the relationships among multiple dimensions and modality of social relationships and subject formations.
Wikipedia
Intersectionality (or intersectional theory) is the study of overlapping or intersecting social identities and related systems of oppression, domination, or discrimination. The theory suggests that—and seeks to examine how—various biological, social and cultural categories such as gender, race, class, ability, sexual orientation, religion, caste, age, nationality and other sectarian axes of identity interact on multiple and often simultaneous levels. The theory proposes that we should think of each element or trait of a person as inextricably linked with all of the other elements in order to fully understand one's identity. This framework can be used to understand how systemic injustice and social inequality occur on a multidimensional basis. Intersectionality holds that the classical conceptualizations of oppression within society—such as racism, sexism, classism, ableism, homophobia, transphobia, xenophobia and belief-based bigotry—do not act independently of each other. Instead, these forms of oppression interrelate, creating a system of oppression that reflects the "intersection" of multiple forms of discrimination.
Intersectionality is an important paradigm in academic scholarship and broader contexts such as social justice work or demography, but difficulties arise due to the many complexities involved in making "multidimensional conceptualizations" that explain the way in which socially constructed categories of differentiation interact to create a social hierarchy. For example, intersectionality holds that there is no singular experience of an identity. Rather than understanding men's health solely through the lens of gender, it is necessary to consider other social categories such as class, ability, nation or race, to have a fuller understanding of the range of men's health concerns.
The theory of intersectionality also suggests that seemingly discrete forms and expressions of oppression are shaped by one another (mutually co-constitutive). Thus, in order to fully understand the racialization of oppressed groups, one must investigate the ways in which racializing structures, social processes and social representations (or ideas purporting to represent groups and group members in society) are shaped by gender, class, sexuality, etc. While the theory began as an exploration of the oppression of women of color within American society, today the analysis is potentially applied to all categories (including statuses usually seen as dominant when seen as standalone statuses).
Intersectionality is ambiguous and open ended, and it has been argued that its "lack of clear-cut definition or even specific parameters has enabled it to be drawn upon in nearly any context of inquiry".