Princeton's WordNet

1. carbon monoxide, carbon monoxide gas, CO(noun)

   an odorless very poisonous gas that is a product of incomplete combustion of carbon

2. cobalt, Co, atomic number 27(noun)

   a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition

3. conscientious objector, CO(noun)

   one who refuses to serve in the armed forces on grounds of conscience

4. Colorado, Centennial State, CO(noun)

   a state in west central United States in the Rocky Mountains

Wiktionary

1. co(Noun)

   company

2. co(Pronoun)

   they .

3. co(Pronoun)

   them .

4. co(Abbreviation)

   care of

5. co(Abbreviation)

   [certificate of origin] a document used for shipping purposes. Describes country of origin of a given product.

6. Co(Abbreviation)

   company ,

• شَرِكَهArabic
• CiaPortuguese (BR)
• Co.German
• CoDanish
• εταιρεία (συντομογρ.)Greek
• compañíaSpanish
• Co, Ko (firmanime osa)Estonian
• CoFinnish
• sociétéFrench
• társaság, tsa.Hungarian
• CoIndonesian
• societàItalian
• ...会社Japanese
• 회사Korean
• bendrovė, kompanijaLithuanian
• kompānijaLatvian
• maatschappij, vennootschapDutch
• AS, (aksje)selskapNorwegian
• spółkaPolish
• كمپنىPersian
• كمپنىPashto
• spol. (spoločnosť)Slovak
• družba, podjetjeSlovenian
• Co., Comp., kompaniSwedish
• บริษัทThai
• ...ŞirketiTurkish
• 公司(縮寫)Chinese (Trad.)
• 公司（缩写）Chinese (Simp.)