Ad hoc

Ad hoc is a Latin phrase which means "for this purpose". It generally signifies a solution that has been custom designed for a specific problem, is non-generalizable, and cannot be adapted to other purposes. Examples include a tailor-made suit, a handcrafted network protocol or a purpose-specific equation. Ad hoc can also have connotations of a makeshift solution, inadequate planning, or improvised events. In technical papers the orthography varies to AdHoc, adhoc, ad-hoc, and other derivates. Please consider when searching the term.
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Adjective
1. often improvised or impromptu; "an ad hoc committee meeting"
(similar) unplanned
2. for or concerned with one specific purpose; "a coordinated policy instead of ad hoc decisions"
(similar) specific
Adverb
1. for one specific case; "they were appointed ad hoc"

ad hoc, for a specific purpose

adj. ad hoc, impromptu, devised for the purpose at hand (e.g. ad hoc committee - committee established for a specific reason)

adj. ad hoc, devised for the purpose at hand