There are 2 definitions of Co in English:

Co1

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symbol

The chemical element cobalt.

Definition of Co in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up

There are 2 definitions of Co in English:

CO2

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abbreviation

1Colombia (international vehicle registration).
1.1Colorado (in official postal use).
1.2Commanding Officer.
1.3Conscientious objector.

Definition of Co in: