co-

UK/ˈkəʊ-/UK/ˌkəʊ-/Canada, US/ˈkoʊ-/Canada, US/ˌkoʊ-/

prefix

Jointly: the root verb is done in coordination between multiple actors or entities

“coadapt”

Similar
con-com-col-cor-syn-syl-sym-inter-
OriginLatin co- ← Proto-Italic *kom- ← Proto-Indo-European *ḱóm →
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Meanings

co-1

prefix
  1. Together: the root word is done co-incidently.
    1. Jointly: the root verb is done in coordination between multiple actors or entities

      coadapt

      2 more examples

      coadoption

      coanalysis

    2. Along with: the root verb is done along with or in addition to others.

      coadsorb

      2 more examples

      coassemble

      coadhesion

    3. Mutually: the root is done in a way that is reciprocal and bidirectional.

      coadherence

      2 more examples

      coattraction

      coannihilate

    4. Simultaneously, done or able to do at the same time.

      cosexual

      3 more examples

      cobirthing

      cocluster

      coagglutination

    5. Spatially located or positioned together, co-located.

      coattend

      2 more examples

      cocirculate

      coarctate

    6. In conjunction: the root needs another entity to take effect, or there is a one-way interaction between them.

      codepletion

      2 more examples

      coantioxidant

      comedication

    7. Moving or oriented in the same direction; co-directional.

      coalign

      2 more examples

      coflowing

      cocurrent

    8. Gender-mixed; having men and women together for the root activity or location.

      co-educate

      1 more example

      co-corrections

  2. Having commonality, similarity with respect to the root.

    coaxial

    2 more examples

    cobelligerent

    coaltitude

    1. Coequal, equal in rank.

      cocaptain

      2 more examples

      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

      2 more examples

      co-parent-in-law

      co-husband

    3. Equally, equal with respect to the root.

      codominant

      1 more example

      coextension

    4. During the same time period as the root.

      coseismic

      2 more examples

      coseasonal

      cotemporality

  3. Complementary in some formal manner.
    1. mathematicsThe difference from some fixed quantity.

      coaltitude

      1 more example

      colatitude

    2. mathematicsDual, relating to the opposite category.

      cocone

      3 more examples

      cocategory

      colimit

      coalgebra

  4. Having multiple targets or effects; the root affects or involves multiple subjects.

    coaccused

    2 more examples

    coaccumulation

    coadsorption

  5. Secondary or auxiliary in rank or priority.

    coname

    3 more examples

    copilot

    coabuser

    cofeature

  6. biochemistryReferring to coenzymes.

    coprotease

    2 more examples

    coglucosidase

    codehydrogenase

  7. chemistryReferring to copolymers.

    codimer

    2 more examples

    copolypeptide

    comonomer

  8. chemistryDeriving from multiple sources.

    copolymer

    2 more examples

    cointercalation

    coconformation

co-2

prefix
  1. abbreviationinformalinitialismInitialism of class of; prefixed to a full or abbreviated year number.

    Class of 2025 (co25) Graduation Information

Synonyms & antonyms

together

Similar
con-com-col-cor-syn-syl-sym-inter-
Also see
com-con-cor-cross-inter-syl-syn-

Origin

co- · prefix

  1. Proto-Indo-European*ḱe?
  2. Proto-Indo-European*ḱóm
  3. Proto-Italic*kom
  4. Proto-Italic*kom-
  5. Latincon-
  6. Latinco-
  7. Englishco-

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

More words from Latin

Full word history & related roots →

co- · prefix

Initialism of class of.

Full word history & related roots →

Translations

Catalan co-
  • co-together, mutually, jointly
Czech spolu-, sou-
  • spolu-together, mutually, jointly
  • sou-together, mutually, jointly
Danish sam-
  • sam-together, mutually, jointly
Dutch mede-
  • mede-together, mutually, jointly
Esperanto kun-
  • kun-together, mutually, jointly
Finnish yhteis-
  • yhteis-together, mutually, jointly
French co-
  • co-together, mutually, jointly
German ko-, mit-
  • ko-together, mutually, jointly
  • mit-together, mutually, jointly
Hindi सम्-, सं-
  • सम्- (sam-)together, mutually, jointly
  • सं- (sã-)together, mutually, jointly
  • हम- (ham-)together, mutually, jointly
Indonesian ko-
  • ko-together, mutually, jointly
Irish comh-
  • comh-together, mutually, jointly
Italian co-
  • co-together, mutually, jointly
Latin co-
  • co-together, mutually, jointly
Norwegian sam-
  • sam-together, mutually, jointly
Persian همـ
  • همـ (ham-)together, mutually, jointly
Polish współ-
  • współ-together, mutually, jointly
Portuguese co-
  • co-together, mutually, jointly
Russian со-, ко-
  • со- (so-)together, mutually, jointly
  • ко- (ko-)together, mutually, jointly
  • взаимо- (vzaimo-)together, mutually, jointly
Spanish co-
  • co-together, mutually, jointly
Swedish ko-, med-
  • ko-together, mutually, jointly
  • med-together, mutually, jointly
Tagalog ka-
  • ka-together, mutually, jointly
Urdu ہمـ
  • ہمـ (ham-)together, mutually, jointly
Cite this entry
APA

co-. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/co-

MLA

“co-.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/co-. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “co-,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/co-.

Source: co- on Wiktionary, CC BY-SA 4.0.