foyer

Foyer is French, from Latin focarium, from focus (hearth, fireplace). In French, a foyer was originally a fireplace or hearth — the center of warmth in a house. By extension, foyer came to mean a home (as in 'foyer familial,' family home), because the hearth was the center of domestic life. The word traveled from the fire to the room that contained the fire to the household that gathered around it.

In the eighteenth century, French theaters adopted foyer for the room where audience members gathered during intermissions. The theater foyer originally had a fireplace — it was where patrons warmed themselves between acts in unheated playhouses. The fire was functional. But as theaters improved their heating, the fireplace disappeared while the word remained. The room kept its name after losing its fire.

English borrowed foyer from French theater vocabulary in the mid-nineteenth century. The word entered English already detached from fire — it named the entrance hall of a theater, the space where the audience congregated before the performance and during intermissions. By the twentieth century, foyer had generalized to mean the entrance hall of any large building: a hotel foyer, an office foyer, an apartment foyer.

The word's journey from fire to entrance hall is a story about what rooms are for. A hearth-room was for warming. A theater foyer was for socializing. A hotel foyer is for arriving. The function changed at each step, but the word kept its association with the threshold — the space you pass through before entering the real event. The fire that once drew people into the room was replaced by the event that drew them through it.