SINGLETON By N., Pam M.S. - April 13, 2013 1. A foetus developing by itself or a single offspring. 2. The only child of 2 parents. SINGLETON: "Joe was a singleton with no brothers or sisters." Related Psychology Terms PARENT-OFFSPRING CONFLICT FAMILY ROMANCE GENERATION FETAL MONITORING FETAL DISTRESS PARENTAL BEHAVIOR CARE OF YOUNG BIRTH PARENT FECUNDITY PRIMAL SCENE Cite this page: N., Pam M.S., "SINGLETON," in PsychologyDictionary.org, April 13, 2013, https://psychologydictionary.org/singleton/ (accessed January 28, 2020).