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The word caste finds its etymological roots in the Latin term castus, meaning "pure" or "chaste." This purity-based connotation undergirds much of how the caste system has been historically understoodβespecially by external observersβas a rigid hierarchy structured around notions of ritual cleanliness. The term entered the Indian lexicon via the Portuguese word casta, used by colonial seafarers and administrators in the 16th century to categorize the unfamiliar, complex social divisions they encountered on the western coast of India. This importation of the term marked a profound epistemic shift. As Nicholas Dirks argues in Castes of Mind (2001), colonial rule did not merely document Indian caste hierarchies; it reified, codified, and bureaucratized them. The colonial state transformed caste from a fluid, local, and context-specific social structure into a rigid administrative category essential to governance.
Prior to this colonial intervention, Indian society spoke of varna and jati. Varna, meaning "color" in Sanskrit, refers to the idealized four-fold division of society into Brahmins (priests), Kshatriyas (warriors), Vaishyas (traders), and Shudras (laborers). However, the everyday lived reality of caste was mediated through jatis, localized, birth-based communities linked to specific occupations and ritual statuses. Jatis are numerousβover 3,000 castes and 25,000 sub-castes exist across Indiaβand form the actual basis of caste identity and exclusion. The colonial flattening of these complexities into the singular term caste was not an act of innocent taxonomy; it was, as Dirks shows, a political maneuver that essentialized caste as the defining feature of Indian civilization, thereby justifying British imperial rule as a civilizing mission.
Sociologically, caste has been defined as a hereditary, endogamous, and hierarchical group characterized by common traditional occupations, social status, and restrictions on mobility. Louis Dumontβs Homo Hierarchicus (1966) famously theorized caste as a system of ritual hierarchy organized around the oppositional categories of purity and pollution. In his structuralist framework, the Brahmin is the apex of purity, while the "Untouchable" (now self-identified as Dalit) is the embodiment of pollution. Although Dumontβs work remains foundational, it has been widely criticized for ignoring the material realities of caste, including land ownership, labor exploitation, and violence. B.R. Ambedkar, the foremost anti-caste intellectual and architect of the Indian Constitution, directly opposed such idealist readings. For Ambedkar, caste was not a religious or ritual order but a system of graded inequality rooted in birth-based discrimination and enforced through violence and denial of rights. In his seminal work Annihilation of Caste (1936), Ambedkar rejected the metaphysical justifications of caste and called instead for its total dismantling, arguing that no reform could succeed without challenging its structural core.
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