SINCE 1828
co
abbreviation (1)Definition of co
(Entry 1 of 5)
1
company
2
county
Co
symbolDefinition of Co (Entry 2 of 5)
cobalt
CO
abbreviation (2)Definition of CO (Entry 3 of 5)
1
cash order
2
Colorado
3
commanding officer
4
conscientious objector
5
corrections officer
c/o
abbreviation (3)Definition of c/o (Entry 4 of 5)
care of
co-
prefixDefinition of co- (Entry 5 of 5)
1
: with : together : joint : jointly
coexist coheir
2
: in or to the same degree
coextensive
3a
: one that is associated in an action with another : fellow : partner
coauthor coworker
b
: having a usually lesser share in duty or responsibility : alternate : deputy
copilot
4
: of, relating to, or constituting the complement of an angle
cosine
Keep scrolling for more
Keep scrolling for more
Comments on co
What made you want to look up co? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
Homophone Quiz
-
- In order to judge how people felt, the senator's office hired a firm to take a
______.
Test your vocabulary with our 10-question quiz!
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
-
Homophone Quiz
More/moor than/then two/too/to.
Take the quiz -
Liar, Liar Quiz
Test your knowledge of words for lies, liars, and those being lied to. In other words, everyone.
Take the quiz -
How Strong Is Your Vocabulary?
Test your vocabulary with our 10-question quiz!
Take the quiz -
Word Winder's CrossWinder
Play the game
Share co
Resources for co