Word.ws English Dictionary

co-

UK/ˈkəʊ-/US/ˈkoʊ-/

co- prefix: jointly: the root verb is done in coordination between multiple actors or entities. Also the initialism of class of.

Prefix

co-

  1. Jointly: the root verb is done in coordination between multiple actors or entities
    • coadoption
    • coadapt
  2. Along with: the root verb is done along with or in addition to others.
    • coassemble
    • coadhesion
  3. Mutually: the root is done in a way that is reciprocal and bidirectional.
    • coadherence
    • coattraction
  4. Simultaneously, done or able to do at the same time.
    • cobirthing
    • cosexual
  5. Spatially located or positioned together, co-located.
    • cocirculate
    • coarctate
  6. In conjunction: the root needs another entity to take effect, or there is a one-way interaction between them.
    • coantioxidant
    • codepletion
  7. Moving or oriented in the same direction; co-directional.
    • coflowing
    • cocurrent
  8. Gender-mixed; having men and women together for the root activity or location.
    • co-corrections
    • co-educate
  9. Having commonality, similarity with respect to the root.
    • coaxial
    • cobelligerent
    1. Coequal, equal in rank.
      • coadministrator
      • coassessor
    2. Indicating a family relationship that indicates a common rank made through three degrees of separation, the middle of which is by marriage.
      • co-sister
      • co-parent-in-law
    3. Equally, equal with respect to the root.
      • codominant
      • coextension
    4. During the same time period as the root.
      • coseasonal
      • coseismic
  10. The difference from some fixed quantity.
    • coaltitude
    • colatitude
  11. Dual, relating to the opposite category.
    • cocategory
    • colimit
  12. Having multiple targets or effects; the root affects or involves multiple subjects.
    • coaccused
    • coaccumulation
Show 4 more meaningsShow fewer meanings
  1. Secondary or auxiliary in rank or priority.
    • copilot
    • coabuser
  2. Referring to coenzymes.
    • coglucosidase
    • coprotease
  3. Referring to copolymers.
    • codimer
    • copolypeptide
  4. Deriving from multiple sources.
    • copolymer
    • cointercalation

Also used as

co- is also the initialism of class of.

co- meaning in Urdu and Persian

co- in Urdu

together, mutually, jointly
ہمـ ham-

co- in Persian

together, mutually, jointly
همـ ham-

Synonyms of co-

Origin of co-

Learned borrowing from Latin co-, from con-, from Proto-Italic *kom-, from *kom, from Proto-Indo-European *ḱóm, possibly from *ḱe.

Initialism of class of.

Words formed from co-

Questions about co-

What does co- mean?
Co- means jointly: the root verb is done in coordination between multiple actors or entities.
What is co- in Urdu?
Co- in Urdu is ہمـ (ham-). See Co- meaning in Urdu.
What part of speech is co-?
Co- is a prefix.
How do you pronounce co-?
Co- is pronounced /ˈkəʊ-/ (UK).

Words near co- in the dictionary

  1. CNY
  2. co
  3. CO detector
  4. CO$
  5. co's
  6. co-
  7. co-act
  8. co-acted
  9. co-acting
  10. co-acts
  11. co-Adamite

Source and license

Adapted from Wiktionary: co- (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Pronunciation audio from Wikimedia Commons, each file under its own free license: LL-Q1860 (eng)-Flame, not lame-co-.wav.

Cite this entry: “co-.” Word.ws, https://word.ws/co-. Based on Wiktionary, CC BY-SA 4.0.