It means “for this purpose”. It’s a temporary position created for a specific purpose. An Ad-hoc is specifically hired to argue a particular key point in which the person is expert.
Claim in the simplest sense means that one requests or demands that he owns or has earned a particular thing. The one who claims is called a Claimant.
Acquisition of private property by the government without giving any compensation
Where a mistake of both parties at the time the contract was made to a basic assumption on which the contract was made has a material effect on the agreed exchange of performances, then the contract is voidable.