Which term refers to the normal development stages toward mature adulthood?

The term that refers to the normal development stages toward mature adulthood is "Adolescence." This period typically encompasses the transition from childhood to adulthood and involves significant physical, emotional, and social changes. During adolescence, individuals develop their identities, establish independence, and navigate complex relationships.

This term is widely recognized in psychology and education as a crucial stage of human development, marking the progression through various phases, including the onset of puberty, cognitive maturation, and the search for personal and social identity.

The other terms listed do not accurately describe this transition. Theological stages refer to development from a religious perspective rather than physical or psychosocial maturation. Etiological phases focus on causes and origins, often in relation to phenomena or conditions, which does not directly describe the stages of personal growth towards adulthood. Phenomenological development relates more to an individual's subjective experience rather than the objective developmental stages associated with growing into adulthood.