ad hoc
/ˌædˈhɒk/adjective & adverb
- formed, arranged, or done for a particular purpose only特别的（地）, 专门的（地）：
as adj. an ad hoc committee特别委员会
the discussions were on an ad hoc basis
讨论是特别安排举行的
as adv. the group was constituted ad hoc.小组是特别组建的。
词源
Latin， literally 'to this'.