We found 10 dictionaries that define the word opsec:

General (4 matching dictionaries)

1. OPSEC: Oxford Learner's Dictionaries
2. OPSEC: Wiktionary
3. OPSEC: Dictionary.com
4. OPSEC, Opsec: Wikipedia, the Free Encyclopedia

Computing (2 matching dictionaries)

5. OPSEC (Open Platform for Security): Linktionary Networking Glossary
6. OPSEC: Encyclopedia

Miscellaneous (2 matching dictionaries)

7. OPSEC: Acronym Finder
8. AbbreviationZ (No longer online)

Slang (1 matching dictionary)

9. opsec: Urban Dictionary

Tech (1 matching dictionary)

10. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

Definitions from Wiktionary (OPSEC) ▸ noun:  (US, military) Abbreviation of operations security. Similar: OPREP, SOCOM, OSINT, SIOP, OPFOR, USINDOPACOM, MARSOC, MEPS, OPSS, COINTELPRO, more... Opposite: infosec, cybersecurity ▸ Words similar to opsec ▸ Usage examples for opsec ▸ Idioms related to opsec ▸ Wikipedia articles (New!) ▸ Popular adjectives describing opsec ▸ Words that often appear near opsec ▸ Rhymes of opsec ▸ Invented words related to opsec