PHASE By N., Pam M.S. - April 7, 2013 noun. 1. a phase in the developing of life, like pubescence or adulthood. 2. a repetitive state of any cyclical procedure . PHASE: "The phases of child development are crucial to adult wellbeing." Related Psychology Terms AMENORRHEA ANAL STAGE VANDENBERGH EFFECT W-STATE PLAYFULNESS ORAL-BITING PHASE BOREDOM OOGENESIS ORCHIDECTOMY WELL-BEING Cite this page: N., Pam M.S., "PHASE," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/phase/ (accessed January 21, 2021).