accommodation

The Latin verb accommodare joined two older pieces: ad, meaning toward, and commodare, meaning to make fit or suitable. Commodare itself descended from commodus, which Romans used to describe anything properly measured and proportional. The Roman philosopher Cicero used accommodatio in the first century BCE to describe the act of adjusting oneself to circumstances, whether in rhetoric, diplomacy, or daily life. The word carried a precise mechanical sense: fitting one thing to another as a craftsman fits a joint.

Medieval Latin writers inherited the word intact and used it to describe physical lodging. The idea was logical: a room prepared for a guest is a space fitted to human needs. French took the word as accommodation in the 16th century, and English borrowed it from French around 1600. By then the word had already split into two distinct tracks: one toward the physical (a place to stay) and one toward the social (an obliging arrangement between parties).

The 17th and 18th centuries stretched the word in several directions. English travelers used it for inns and hired rooms. Merchants used it for credit extended as a favor. Theologians used it to describe the Bible's language as accommodation to human understanding, a term John Calvin developed at length. Each use kept the original Roman idea intact: something adjusted to fit a particular need.

By the 19th century, accommodation had become so useful that it appeared in contracts, railway timetables, and social correspondence. The plural accommodations meant lodgings in American English while British English preferred the singular. The word also entered psychology and biology: Jean Piaget used it to describe how the mind adjusts its schemas to new experience, and ophthalmologists use it for the eye's focusing adjustment. The original Roman sense of fitting held through every transformation.