rêverie

Rêverie is French, from rêver, meaning to dream. But in Old French, resver meant to wander, to rave, or to be delirious. A person who was resvant was not pleasantly daydreaming. They were talking nonsense, possibly feverish, possibly mad. The journey from delirium to daydream took several centuries, and the word arrived at its modern meaning by slowly trading intensity for gentleness.

By the seventeenth century, French rêverie had softened to mean a state of abstracted musing — the kind of unfocused thinking that happens when the mind drifts without direction. Montaigne wrote about rêverie as a natural and not entirely unwelcome state. Rousseau went further: in his Reveries of the Solitary Walker (1782), he elevated rêverie to a philosophical practice. For Rousseau, reverie was not an absence of thought but a different kind of thought — one that was free, unsystematic, and closer to truth than disciplined reasoning.

English borrowed reverie in the mid-seventeenth century, already in its softened sense. The word settled into the language as a pleasant term for daydreaming, wool-gathering, or being lost in thought. It is almost always used positively or neutrally. 'She fell into a reverie' implies no criticism. The Old French association with madness has been entirely erased from the English word — though French retains a trace of it in the expression 'rêveries de fiévreux' (a feverish person's ravings).

Neuroscience has given reverie a technical afterlife. The 'default mode network,' identified by Marcus Raichle in 2001, describes the brain regions that activate when the mind wanders — when a person is in reverie rather than focused on a task. The network turns out to be essential for self-reflection, memory consolidation, and creative problem-solving. The state the Old French called raving and the modern English called idle may be neither.