saint

Saint comes from Latin sanctus, "holy" or "consecrated," a past participial form from the verb sancire, "to consecrate, ratify, or make inviolable." Roman legal and religious language used sanctus for what had been set apart under binding protection. The word carried authority before it carried halos. It named a status of holiness, not yet a title for a specific kind of person.

Christian Latin made the shift clear by the 4th century CE. Sanctus became the standard title for holy persons, martyrs, and the faithful dead, and plural sancti could mean the whole body of believers. The term then narrowed in popular devotion toward named holy figures recognized for exemplary life or martyrdom. A quality became an honorific.

Old French saint preserved the form that English later borrowed after the Norman Conquest. By Middle English, saint was the ordinary word for a canonized holy person and also for biblical holy figures. The spelling stayed French-looking while the meaning stayed ecclesiastical. The noun became fixed even as the adjective holy remained separate.

Modern English uses saint for an officially recognized holy person, for revered figures in religious tradition, and more loosely for an unusually patient or virtuous person. The older force of sanctity still clings to it. To call someone a saint is to say they belong on the far side of ordinary conduct. The title began as a legal-sacred adjective and ended as a human ideal.