- Organization of American States
- Organisation de l'armée secrète; an organization of European settlers in Algeria who opposed Algerian independence by acts of terrorism (1961–63)
WordReference Random House Unabridged Dictionary of American English © 2026
OAS,
- GovernmentSee Organization of American States.
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OAS abbreviation for
'OAS' also found in these entries (note: many are not synonyms or translations):