Individuals who are beyond postsecondary education age, are employed on a full- or part-time basis and are enrolled in a formal or informal educational program.
Generally describes a participant in post-secondary education who is older than the conventional age range of 18 to 21. Some institutions define "adult" in terms of role - e.g. a wage earner who has left formal education for a designated number of years.
Adult learner is a term used to describe any person socially accepted as an adult who is in a learning process, whether it is formal education, informal learning, or corporate-sponsored learning.