composte

Compost comes from Old French composte, from Latin compositum, the past participle of componere — 'to put together.' Com- (together) plus ponere (to place). The same root produced 'compose,' 'composition,' 'component,' and 'compound.' A compost heap is, in the language's memory, a composition of organic materials. The word entered English in the fourteenth century and initially meant a mixture of any kind — a composte of fruits, a composte of herbs.

The agricultural meaning narrowed the word. By the sixteenth century, English 'compost' referred specifically to a mixture of organic matter used to fertilize soil. The process — deliberate decomposition of plant waste, manure, and other organic materials — was ancient. Roman farmers composted. Pliny the Elder described the practice. The word caught up to the technique two millennia after the technique was established.

George Washington composted. His Mount Vernon estate maintained compost piles, and his letters discuss the practice in detail. Sir Albert Howard, the British agronomist working in India in the 1930s, developed the Indore method of composting — a systematic layering technique learned partly from Indian farmers — and published An Agricultural Testament in 1940. Howard is often called the father of modern composting, though Indian farmers had been doing it for centuries without the title.

Municipal composting programs now operate in cities from San Francisco to Seoul. The word has expanded from garden practice to urban infrastructure. Compostable packaging, compost bins, compost pickup. The Latin compositum — 'put together' — now names the deliberate reverse of manufacture: taking finished products and returning them to soil. Composition, then decomposition. The word contains both.