IPA: /ˌkrɪməˈnɒlədʒi/
KK: /ˌkrɪməˈnɑlədʒi/
The scientific study of crime, criminals, and the behavior associated with criminal activity.
She decided to major in criminology to understand the causes of crime better.
Criminology is formed from "crimen" (from Latin, meaning crime) and "-logy" (from Greek "logia", meaning study or discourse). The word refers to the study of crime and criminal behavior.
Think of 'crime' ('crimen') and 'study' ('-logy') together — criminology is the study of crime.