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Doctor of Philosophy, abbreviated Ph.D. or PhD for the Latin Philosophiæ Doctor, meaning "teacher of philosophy", (or, more rarely, D.Phil., for the equivalent Doctor Philosophiæ) is an advanced academic degree awarded by universities. In some, but not all countries in the English-speaking world, it has become the highest degree one can earn (but see also the Higher doctorates awarded by universities in the UK, Ireland and some Commonwealth countries) and applies to graduates in a wide array of disciplines in the sciences and humanities. The Ph.D. has become a requirement for a career as a university professor or researcher in many fields. In addition, many Ph.D. graduates go on to careers in government departments, non-governmental organizations (NGOs), or in the private sector.[1] The detailed requirements for award of a Ph.D. vary throughout the world; however, there are a number of common factors. A candidate must submit a thesis or dissertation consisting of a suitable body of original academic research, which is in principle worthy of publication in a peer-refereed context.[2] In many countries a candidate must defend this work before a panel of expert examiners appointed by the university; in other countries, the dissertation is examined by a panel of expert examiners who stipulate whether the dissertation is in principle passable and the issues that need to be addressed before the dissertation can be passed. There is usually a prescribed minimum period of study — typically two to three years full time — which must take place before submission of the thesis. This requirement is usually waived for academic staff submitting a portfolio of peer-reviewed published work. The candidate may also be required to successfully complete a certain number of additional, advanced courses relevant to his or her area of specialization. In some countries (the US, Canada, Denmark, for example), most universities require coursework for Ph.D. degrees. In many other countries (especially those which have a greater degree of specialization at the undergraduate level, such as the UK) there is no such condition in general. It is not uncommon, however, for individual universities or departments to specify analogous requirements for students not already in possession of a master's degree. Universities in the non-English-speaking world have begun adopting similar standards to those of the Anglophone Ph.D. for their research doctorates (see, for example, Bologna Process).[3] The origins of the doctorate dates back to the ijazat attadris wa 'l-ifttd ("license to teach and issue legal opinions") in the medieval Madrasahs from the 9th century, though it was limited to Islamic law at the time, as in a Doctor of Laws degree.[4] The doctorate was later extended to philosophy in the European universities in the Middle Ages which generally placed all academic disciplines outside the professional fields of theology, medicine and law under the broad heading of "philosophy" (or "natural philosophy" when referring to science). The degree of Doctor of Philosophy was a doctorate, generally granted as honorary degrees to select and well-established scholars.[citation needed]
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