ad hoc

Từ điển Oxford Learners Wordfinder Dictionary

I - adjective

1. often improvised or impromptu
- an ad hoc committee meeting
• Similar to:
unplanned
2. for or concerned with one specific purpose
- a coordinated policy instead of ad hoc decisions
• Similar to:
specific

II - adverb

for one specific case (Freq. 1)
- they were appointed ad hoc