The phrase "fixed role" is correct and usable in written English.
You can use it to describe a role in a job or other situation that has a specific purpose and does not change. For example, you might say, "I was hired for a fixed role in the company, which required me to take on certain responsibilities."
From the earlier work of each, you can guess who's doing what — Mr. Ambarchi likes long, bottom-heavy guitar tones; Mr. O'Rourke likes certain keyboard sounds — but neither has a fixed role.
We have been able to leverage the culture of social obligation to create a subculture, in which one's duty to the group is to ask questions and facilitate one another's learning, rather than to merely fulfill a fixed role.
At the beginning of our experiment, subjects were informed about their (fixed) role as either an expert or a consumer, and they received an initial endowment of 200 experimental currency units (ECU), equivalent to 2.5 Euro.
It was founded on the older idea that human beings have a fixed set of natural rights and that the fixed role of government is simply to secure those rights, otherwise leaving people to take care of themselves.
Notwithstanding the time frame negotiated by each party for adjusting practices and institutions, the TPP ultimately aims to establish one criterion of wellbeing, freedom and development, as well as a fixed role for participants in the global value chains, without either consideration for their domestic needs and beliefs or an understanding of what is best for their local communities.
As the premier international clearinghouse for surplus capital, London has a pretty fixed role in the world economy, and the major's job is purely managerial.
Within these circles, employees won't have fixed roles, or an expectation of working any longer than is expedient and effective.
Accordingly, we want to endorse the idea of a 3-dimensional continuum from fixed roles to flexibility, from uniparental to biparental care, and from early to late assumption of parental roles when thinking about the evolution of parental care.
Murphy's villainy, too, is fixed; his role, established early on, never changes.
The phrase most associated with him is "total football", a fluid system in which no player occupies any fixed outfield role.
It instilled an interest in the museum and arts world and basically helped pave the way for me to get a fixed contract role at the National Portrait Gallery, cataloguing its collection of 20th-century photographs.
