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psychology (n.)

1650s, "the study of the soul," from Modern Latin psychologia, probably coined mid-16c. in Germany by Melanchthon from Latinized form of Greek psykhē "breath, spirit, soul" (see psyche) + logia "study of" (see -logy). The meaning "science or study of the phenomena of the mind" is attested by 1748, in reference to Christian Wolff's "Psychologia empirica" (1732). The modern behavioral sciences sense is from the early 1890s.

Origin and meaning of psychology

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Definitions of psychology from WordNet

psychology (n.)
the science of mental life;
Synonyms: psychological science
From wordnet.princeton.edu