[psy.cho.dy.nam.ics] n pl but sing or pl in constr (1874) 1: the psychology of mental or emotional forces or processes developing esp. in early childhood and their effects on behavior and mental states
2: explanation or interpretation (as of behavior or mental states) in terms of mental or emotional forces or processes
3: motivational forces acting esp. at the unconscious level -- psy.cho.dy.nam.ic adj -- psy.cho.dy.nam.i.cal.ly adv