The phrase "are typically defined" is correct and usable in written English.
It can be used when discussing general characteristics or common understandings of a concept or term.
Example: "In academic literature, terms are typically defined to ensure clarity and consistency in communication."
Alternatives: "are generally described" or "are commonly outlined".
Food systems are typically defined as comprising all activities that are part of the production, distribution, and consumption of food.
Product systems are typically defined by complex technical foreground systems and immersed in highly diverse contexts and background systems.
This paper extends the MKS framework to applications involving microstructure evolution, where the local states are typically defined in a continuous local state space.
As the boundaries of estuaries are typically defined by topography, rarely do significant changes in the area of the ecosystem occur.
In 2009 he helped recruit Sara Shneiderman, then a postdoc at Cambridge University, as an assistant professor of anthropology—"a very unusual hiring," says Shneiderman, because "the Himalayas are typically defined as peripheral" to South Asian Studies.
Races are typically defined as sprint, up to 30 miles (50 km); mid-distance, between 50 and 200 miles (80.5 and 320 km); and long-distance, between 200 and 1,000 miles or more (320 and 1,600 km).
In thinking of artists who could be paired with programmers, who are typically defined as highly productive and math-oriented, Simon's methodology, which is marked by the rigorous gathering, comparison, and analysis of data, seemed to be a point of commonality.
Millennials are typically defined as those born between 1982 and 2000.
Millennials, also known as Generation Y, are typically defined as young adults born after the early 1980s.
Network core and periphery are typically defined in terms of assortative mixing.
These metrics are typically defined in terms of time, cost, fidelity, and security.
