security officer
/sɪˈkjʊrɪti ˈɒfɪsər/ · se·cu·ri·ty of·fi·cer
noun
- A person employed to protect people, property, or information, typically by monitoring, patrolling, and enforcing rules. The security officer escorted the guests through the museum after hours.
- A law‑enforcement or corporate employee assigned to security duties, such as at an airport, bank, or corporate campus. At the airport, the security officer checked all passengers' boarding passes before they entered the gate area.
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Did you know? The title "security officer" gained prominence in the 1970s as private security firms expanded, and the abbreviation "SO" is now a standard job code in many corporate security departments.