co-

From Latin co-, allomorph of Latin con-.

• enPR: kōʹ
  • (Received Pronunciation) IPA^(key): /ˈkəʊ-/
  • (General American) IPA^(key): /ˈkoʊ-/
  • (General Australian) IPA^(key): /ˈkəʉ-/
• (unstressed) enPR: kŏ, IPA^(key): /kɒ/

co-

1. together; mutually; jointly
2. partner or subordinate in an activity
3. to the same degree
4. (mathematics) of the opposite, of the counterpart; dual

   cokernel; codimension; cosine; counion; cointersection

• With many terms, a hyphen (-) is used in British English, and is omitted in American English.

• (together): con-/com-/col-/cor-, syn-/syl-/sym-, inter-

• cooperate
• cosemisimple
• coseparable
• cosplit
• counital

• “co-”, in OneLook Dictionary Search.
• “co-”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• John A. Simpson and Edmund S. C. Weiner, editors (1989), “co-”, in The Oxford English Dictionary, 2nd edition, Oxford: Clarendon Press, →ISBN. -- lists many derived terms

• O. C., O.C., OC, Oc, Oc.

From Latin co-.

co-

1. co- (together; jointly)

• “co-” in Diccionari de la llengua catalana, segona edició, Institut d’Estudis Catalans.
• “co-”, in Gran Diccionari de la Llengua Catalana, Grup Enciclopèdia Catalana, 2024
• “co-” in Diccionari normatiu valencià, Acadèmia Valenciana de la Llengua.

• IPA^(key): /ko/, /kɔ/

• Audio

  (file)

co-

1. co- (together; jointly)

co-

1. co-

• (Classical) IPA^(key): /ko/, [kɔ]
• (modern Italianate Ecclesiastical) IPA^(key): /ko/, [ko]

co-

1. allomorph of con-

Used before vowels and h, but not the consonants /j/ and /w/.

From Old Irish com-.

co-

1. co-

• G. Toner, M. Ní Mhaonaigh, S. Arbuthnot, D. Wodtko, M.-L. Theuerkauf, editors (2019), “com-”, in eDIL: Electronic Dictionary of the Irish Language

From co.

• IPA^(key): /t͡sɔ/

co-

1. Forms adjectives and adverbs specifying how often something happens: -ly

   ‎co- + ‎dzienny → ‎codzienny (“daily”)

   ‎co- + ‎godzinny → ‎cogodzinny (“hourly”)

   ‎co- + ‎miesięczny → ‎comiesięczny (“monthly”)

   ‎co- + ‎roczny → ‎coroczny (“yearly”)

• co- in Polish dictionaries at PWN

Borrowed from Latin co-.

co-

1. co-

Never takes a hyphen in modern spelling.

• comh-

From Old Irish com-.

co-

1. Usually (but not always) designates mutuality or reciprocity.

• G. Toner, M. Ní Mhaonaigh, S. Arbuthnot, D. Wodtko, M.-L. Theuerkauf, editors (2019), “com-”, in eDIL: Electronic Dictionary of the Irish Language

From Latin co-.

• IPA^(key): /ko/ [ko]
• Syllabification: co-

co-

1. co-

• “co-”, in Diccionario de la lengua española, Vigésima tercera edición, Real Academia Española, 2014