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What does O1 stand for?

What does O1 mean? We have 4 definitions. Read most used O1 meanings below.

Category: All acronyms (4)Government & Military (1)

• O1 — Only one
• O1 — Officer grade: Ensign or 2nd Lieutenant
• O1 — Orbitor 1
• O1 — Organized Naval Reserve Seagoing

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Most Searched Abbreviations For Words

• Only one
• Only one
• Reserv
• Organ
• Only
• One