means An extraordinary event that seems to defy natural law and is taken as a sign of divine or supernatural intervention.

from From Latin miraculum, 'an object of wonder,' built on mirari, 'to wonder at, to be astonished' — the same root that gives us 'admire,' 'mirage,' and even 'mirror.' At its heart sits the idea of looking and being amazed by what you see. It entered English through Old French in the medieval period, when miracles were the headline acts of saints and shrines, and has kept its sense of jaw-dropping astonishment ever since.