Quaternary education or postgraduate education is the fourth-stage educational level which follows the completion of an undergraduate degree at a college or university. Graduate school is an example of quaternary education; some consider masters-level degrees as part of tertiary education; some consider postdoctoral positions to be quaternary education while others consider them to be jobs. A degree is any of a wide range of awards made by institutions of higher education, such as universities, normally as the result of successfully completing a program of study. ... A college (Latin collegium) can be the name of any group of colleagues; originally it meant a group of people living together under a common set of rules (con-, together + leg-, law). As a consequence members of colleges were originally styled fellows and still are in some places. ... A university is an institution of higher education and of research, which grants academic degrees. ... A graduate school is the school that a college student may attend after completion of his undergraduate education in order to obtain a degree higher than a bachelors degree. ... Tertiary education, also referred to as third-stage or third level education, is the educational level following the completion of a school providing a secondary education such as a high school, secondary school, or gymnasium. ... A postdoctoral (colloquially, post-doc) appointment is a usually temporary academic job held by a person who has completed his or her doctoral studies. ...
In Australia and the UK, this term is normally not used. Postgraduate study is considered part of tertiary education.
Secondary education is a period of education which, in most contemporary educational systems of the world, follows directly after primary education, and which may be followed by tertiary, "post-secondary", or "higher" education (e.g., university).
In some educational systems, secondary schools are literally termed middle schools; the use of this term, however, is not consistent around the world as middle school in some systems refers to the first period of secondary schooling, or alternately, the last period of primary education.
Primary and secondary education together are sometimes (in particular, in Canada, Australia and the United States) referred to as "K-12" education, (K is for kindergarten, 12 is for twelfth grade).