An ad hoc member is basically a non-voting member of a group or board for a specific purpose. It may be temporary in it's scope or long term. It's a way to get expertise or help for a specific goal without endowing other rights to the member.
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An ad hoc professor is one that is hired on an as-needed or as-required basis. Generally, ad hoc professors do not receive the same benefits as regular professors, so this saves the university or college money.
400 AD
any year after AD 800 and before AD 901
1000 AD
The 4th Millennium AD will commence on Thursday, January 1, 3001 AD.