structure

The Latin verb struere meant to pile, to lay flat, to heap stone on stone. Cicero used the noun structura in the first century BCE to describe not just buildings but the arrangement of words in a sentence, the way a period could be as carefully mortared as a wall. Beneath struere lies a Proto-Indo-European root, strew-, meaning to spread or scatter, the original gesture before imposing order. The word for architecture was also, from the beginning, a word for deliberate arrangement.

Isidore of Seville, writing his encyclopedic Etymologiae around 620 CE, used structura to describe the physical order of buildings and the organizational logic of scripture. The word passed into Old French as structure by the thirteenth century without losing its architectural weight. English borrowed it directly in the fifteenth century, and for two more centuries it named only physical things: the structure of a cathedral, of a ship, of a wall.

The expansion into abstraction happened in the seventeenth century. John Locke's 1690 Essay Concerning Human Understanding applied structure to how ideas are arranged in the mind. Biologists adopted it for anatomy, economists for markets, and grammarians for sentences. The word was becoming a general tool for describing any system of parts held in relation.

Ferdinand de Saussure's linguistics lectures, published posthumously in 1916, placed structure at the center of how meaning works. His argument was that no element of language means anything alone: meaning arises from the relations between elements, not from the elements themselves. This idea, structuralism, reshaped anthropology, literary criticism, and psychoanalysis through the twentieth century. The old mason's noun had become a philosophical axiom.