• this (latin)
• impromptu, devised for the purpose at hand (e.g. ad hoc committee - committee established for a specific reason)
• for a specific purpose
• an ad hoc arrangement is one which is unplanned and which takes place only because a situation has made it necessary.
post hoc ergo propter hoc
• (latin) "after this therefore because of this", logical fallacy that simply because one thing happens after another the first event was a cause of the second event
• to this extent (latin)