(dated, rare) a place devoid of people

mental state, mentality / psychology

(education) highest academic grading in the S-A-B-C-F scale / (chiefly video games) S, the highest rank or grade (above A) commonly used in ranking systems in video games

small size

(sexuality, euphemistic) sadism, sadist / (colloquial) dominant personality

experimental psychology

(criminology, psychology) criminal psychology; the study of the criminal mind

clinical psychology

parapsychology

(psychology) gestalt psychology