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What does *O* stand for?

What does *O* mean? We have 15 definitions. Read most used *O* meanings below.

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• O AND D MARKET (ORIGINATION AND DESTINATION). — A city from which a great many passengers both begin and end their travel. Boston is an example of an O and D market.
• PAC O — Pacific Ocean
• SIX O'CLOCK KNOCK. — Slang. On a cruise ship, the firing of a crew member, which typically takes place with a wake up call at six a.m. after which the crew member is escorted immediately off the ship.
• O — Orange
• O — Often
• O — Pint
• O — Organism
• O — Open
• O — October
• O — Old
• O — Optimization
• O — Ordinary
• O — Outside
• O — Octopus
• O — Osten

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