I. ˈad-ˈhäk, -ˈhōk; ˈäd-ˈhōk adverb
Etymology: Latin, for this
Date: 1659
: for the particular end or case at hand without consideration of wider application
II. adjective
Date: 1879
1.
a. : concerned with a particular end or purpose
an ad hoc investigating committee
b. : formed or used for specific or immediate problems or needs
ad hoc solutions
2. : fashioned from whatever is immediately available : improvised
large ad hoc parades and demonstrations — Nat Hentoff