Merriam-Webster Online:

Main Entry: mir·a·cle
Pronunciation: \ˈmir-i-kəl\
Function: noun
Etymology: Middle English, from Anglo-French, from Late Latin miraculum, from Latin, a wonder, marvel, from mirari, to wonder at
Date: 12th century
1: an extraordinary event manifesting divine intervention in human affairs
2: an extremely outstanding or unusual event, thing, or accomplishment
3Christian Science: a divinely natural phenomenon experienced humanly as the fulfillment of spiritual law

~Susan