There are 2 definitions of Co in English:

Co1

Syllabification: Co

symbol

The chemical element cobalt.

Definition of Co in:

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Word of the day humoresque
Pronunciation: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music

There are 2 definitions of Co in English:

CO2

Syllabification: CO

abbreviation

1Colorado (in official postal use).
1.1Commanding Officer.
1.2Conscientious objector.

Definition of Co in: