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Academic personnel, also known as faculty (in North American usage) or academics (in British, Australia, and New Zealand usage), are the staff of a university: professors of various ranks, lecturers, and/or researchers. The term faculty in this sense is most commonly used in this context in the United States and Canada, and generally includes professors of various ranks: adjunct professors, assistant professors, associate professors, and (full) professors, usually tenured (or tenure-track) in terms of their contract of employment. In British and Australian/NZ English "faculty" usually refers to a university's department (or college), not to the employees.
In many universities, the members of the administration (e.g., department chairs, deans, vice presidents, presidents, and librarians) are also faculty members; many of them begin (and remain) as professors. At some universities, the distinction between "academic faculty" and "administrative faculty" is made explicit by the former being contracted for nine months per year, meaning that they can devote their time to research (and possibly be absent from the campus) during the summer months, while the latter are contracted for twelve months per year. These two types of faculty members are sometimes known as "nine-month faculty" and "twelve-month faculty". Faculty who are paid a nine-month salary are typically allowed to seek external funds from grant agencies to partially or fully support their research activities during the summer months.
Most university faculty members hold a Ph.D. or equivalent highest-level degree in their field. Some professionals or instructors from other institutions who are associated with a particular university (e.g., by teaching some courses or supervising graduate students) but do not hold professorships may be appointed as adjunct faculty.
Other than universities, some community colleges and secondary or primary schools use the terms faculty and professor. Other institutions (e.g., teaching hospitals) may likewise use the term faculty. In countries like the Philippines, faculty is used more broadly to refer to teaching staff of either a basic or higher education institution.
In North America, faculty is a distinct category from staff, although members of both groups are employees of the institution in question. This is distinct from, for example, the British (and European, Australia, and New Zealand) usage, in which all employees of the institution are staff either on academic or professional (i.e. non-academic) contracts.