- 1happening or existing before something else or before a particular time Although not essential, some prior knowledge of statistics is desirable. This information must not be disclosed without prior written consent. Visits are by prior arrangement. Please give us prior notice if you need to check in early. She will be unable to attend because of a prior engagement.
- 2already existing and therefore more important They have a prior claim to the property.
- 3prior to (formal) before something during the week prior to the meeting
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NAmE//ˈpraɪər//[only before noun]