c/o

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c/o

preposition ℅ · c/-

abbreviation Abbreviation of care of, used to identify an intermediary who is responsible for transferring a piece of mail between the postal system and the final addressee. 1976-1977, Lou Sullivan, personal diary, quoted in 2019, Ellis Martin, Zach Ozma (editors), We Both Laughed In Pleasure Sunday I penned my letter, Monday I mailed it c/o the high school.
abbreviation Abbreviation of complain of, used to identify symptoms described by a patient. She was admitted to the hospital 6 days ago with c/o nausea, vomiting, and RUQ [right upper quadrant of the abdomen] pain. Her diet has not advanced beyond clear liquids, which she failed to tolerate on two attempts. Roa continues to c/o nausea and RUQ pain.
abbreviation Abbreviation of corner of; frequently used especially in Namibia for physical addresses.

noun c/o's · c/os · C/O · CO

abbreviation, initialism Initialism of certificate of origin, a document describing a product's country of origin.

Translations

Every language

prep (abbreviation) identifies intermediary in delivering mail — see also care of

Español	a
Português	a, c
Français	a, s
Deutsch	p. Adr., p. A., c, o
Italiano	c, o

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MLA

"c/o." Wiktionary, via Micwyn, micwyn.com/word/c%2Fo. Accessed 6 Nov. 2026.

APA

c/o. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/c%2Fo

Chicago

"c/o." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/c%2Fo.

BibTeX

@misc{c_o_2026,
  title = {c/o},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/c%2Fo},
  urldate = {2026-11-06}
}