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.
An Annuity is a right to receive a fixed period of payments, for life or a term of years that is created by a contract or other legal document.
A cemetery is a place where cremated remains or dead bodies are buried. It is a place owned by a government authority or the private enterprise.
For a title to be valid, that title should be freed from defects.