ad hoc

adjectives

often improvised or impromptu
"an ad hoc committee meeting"
ad hoc
is similar to
without apparent forethought or prompting or planning
"an unplanned economy"; "accepts an unplanned order"; "an unplanned pregnancy"; "unplanned remarks"
unplanned
for or concerned with one specific purpose
"a coordinated policy instead of ad hoc decisions"
ad hoc
is similar to
(sometimes followed by `to') applying to or characterized by or distinguishing something particular or special or unique
"rules with specific application"; "demands specific to the job"; "a specific and detailed account of the accident"
specific

adverbs

for one specific case
"they were appointed ad hoc"
ad hoc