"A job type defined in terms of a set of responsibilities." (Atul Apte, "Java Connector Architecture: Building Custom Connectors and Adapters", 2002)
"A set of expectations for behavior; describes the extent to which each individual performs activities related to project." (Timothy J Kloppenborg et al, "Project Leadership", 2003)
"Specified responsibilities that identify a set of related activities to be performed by a designated individual (e.g., a project manager)." (Richard D Stutzke, "Estimating Software-Intensive Systems: Projects, Products, and Processes", 2005)
"A definition of the behavior and responsibilities of an individual or set of individuals working together as a team." (Bruce MacIsaac & Per Kroll, "Agility and Discipline Made Easy: Practices from OpenUP and RUP", 2006)
"A defined set of work tasks, dependencies, and responsibilities that can be assigned to an individual as a work package. A role describes a collection of tasks that constitute one component of a process, and would normally be performed by an individual." (Sally A Miller et al, "People CMM: A Framework for Human Capital Management" 2nd Ed., 2009)
"The set of expectations in a social system that define the services individuals or groups are supposed to provide." (Alexander Grashow et al, "The Practice of Adaptive Leadership", 2009)
"The characteristic and expected behaviors of an individual, derived from his or her responsibilities and preferences in providing value to the organization." (David Lyle & John G Schmidt, "Lean Integration", 2010)
"1.Generally, a label assigned to a set of connected behaviors, rights and obligations. 2.In data modeling, the way in which entities of one type relate to entities of another type in a relationship. 3.In data security, a name used to refer to the logical set of related responsibilities assignable to a person or organization, and to parties with these assigned responsibilities." (DAMA International, "The DAMA Dictionary of Data Management", 2011)
"A defined function to be performed by a project team member, such as testing, filing, inspecting, coding." (Cynthia Stackpole, "PMP® Certification All-in-One For Dummies®", 2011)
"Description of specific skills, qualifications and work profiles in software development. These should be filled by the persons (responsible for these roles) in the project." (Tilo Linz et al, "Software Testing Foundations" 4th Ed., 2014)
"Usual or expected functionality of an actor in the context of an activity or a business process; an actor can have one or several roles. " (Gilbert Raymond & Philippe Desfray, "Modeling Enterprise Architecture with TOGAF", 2014)
"A defined function to be performed by a project team member, such as testing, filing, inspecting, or coding." (Project Management Institute, "A Guide to the Project Management Body of Knowledge (PMBOK Guide )", 2017)
"In ITIL, this is a set of responsibilities, activities and authorities granted to a person or team. A role is defined in a process. One person or team may have multiple roles, for example the roles of configuration manager and change manager may be carried out by a single person." (Brian Johnson & Leon-Paul de Rouw, "Collaborative Business Design", 2017)
"A defined function to be performed by a project team member, such as testing, filing, inspecting, coding." (Jeffrey K Pinto, "Project Management: Achieving Competitive Advantage" 5th Ed., 2018)
"A set of responsibilities, activities and authorities granted to a person/team." (ITIL)