Main Entry: ob·ser·va·tion

Pronunciation: \ˌäb-sər-ˈvā-shən, -zər-\

Function: noun

1 : the noting of a fact or occurrence (as in nature) often involving the measurement of some magnitude with suitable instruments <temperature observations> ; also : a record so obtained
2 : close watch or examination (as to monitor or diagnose a condition) <postoperative observation> <psychiatric observation>