Final answer:
Jeffery Arnett coined the term 'emerging adulthood' to describe the period between 17 and 22 years of age, characterized by exploration and development in the domains of work and love.
Step-by-step explanation:
Jeffery Arnett refers to the developmental period between 17 and 22 years of age as emerging adulthood. This concept describes a phase where individuals undergo significant identity exploration, particularly emphasizing work and love as central concerns. This period is characterized as an in-between time when young adults continue to develop psychologically and socially. The reasons for the emergence of this distinct developmental stage include prolonged education, later marriage ages, and a shifting labor market. During emerging adulthood, individuals have the opportunity to explore different lifestyles and possibilities before making long-term commitments.