/ saɪˈkɒlədʒi; NAmE -ˈkɑːl-/ noun
1.
[ U ] the scientific study of the mind and how it influences behaviour :
social / educational / child psychology
—compare pop psychology
2.
[ sing. ] the kind of mind that sb has that makes them think or behave in a particular way :
the psychology of small boys
3.
[ sing. ] how the mind influences behaviour in a particular area of life :
the psychology of interpersonal relationships
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WORD ORIGIN
late 17th cent.: from modern Latin psychologia (see psycho- , -logy ).