The document traces the evolution of the definition of corporate social responsibility (CSR) from the 1950s to the 1990s. Definitions of CSR expanded in the 1960s and proliferated in the 1970s. In the 1980s, fewer new definitions emerged while empirical research and alternative themes like corporate social performance, stakeholder theory, and business ethics matured. By the 1990s, CSR continued as a core concept but yielded to alternative thematic frameworks.