What did Hippolyte Taine mean by milieu in his theory of literary criticism?

In his theory of literary criticism, the French thinker Hippolyte Taine identified milieu as one of the three primary conditioning factors—alongside race and moment—that shape a work of art.12

Taine defined milieu as the specific social, political, and geographical environment that modifies an individual's inherited racial disposition. By analyzing these external circumstances, Taine believed critics could apply a scientific method to literature, moving beyond subjective interpretation to understand the causal forces that determine a writer's work and the psychology of their culture.12

Essentially, Taine argued that a literary work is not created in a vacuum but is the product of the author's personality interacting with their surrounding environment and historical context. This deterministic approach was central to his broader commitment to 19th-century positivism, which sought to apply the rigor of the scientific method to the humanities.2