1 a) relating to, characteristic of, directed toward, influencing, arising in, or acting through the mind esp. in its affective or cognitive functions <\psychological phenomena> <the \psychological aspects of a problem>
b) directed toward the will or toward the mind specif. in its conative function <\psychological warfare>
2) relating to, concerned with, deriving from, or used in psychology <\psychological research> <\psychological tests> <a \psychological clinic>
psy·cho·log·i·cal·ly -ē adv
Medical dictionary. 2011.