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• Cid
  Cid

  noun

  The, El Cid CampeadorRodrigo Díaz de Bivar, c1040–99, Spanish soldier: hero of the wars against the Moors.
• c.i.d.
  c.i.d.

  abbreviation

  cubic-inch displacement: the displacement of an engine measured in cubic inches.
• C.I.D.
  C.I.D.

  abbreviation

  Criminal Investigation Department of Scotland Yard.
• CID
  CID

  abbreviation

  (in Britain) Criminal Investigation Department; the detective division of a police force

Cid

¹ American  

[sid, theed] / sɪd, θid /

noun

1. The, El Cid CampeadorRodrigo Díaz de Bivar, c1040–99, Spanish soldier: hero of the wars against the Moors.

2. (italics) Le. Le Cid.

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c.i.d. ² American  

Or cid,

abbreviation

Automotive.

1. cubic-inch displacement: the displacement of an engine measured in cubic inches.

   My old car had a 302 c.i.d. engine.

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C.I.D. ³ American  

abbreviation

1. Criminal Investigation Department of Scotland Yard.

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CID ¹ British  

abbreviation

1. (in Britain) Criminal Investigation Department; the detective division of a police force

2. cruel, inhumane, and degrading: denoting the brutal and demeaning treatment of prisoners

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Cid ² British  

/ sɪd, θið /

noun

1. El or the. original name Rodrigo Diaz de Vivar. ?1043–99, Spanish soldier and hero of the wars against the Moors

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Etymology

Origin of C.I.D.

First recorded in 1900–05

Example Sentences

See Examples For:

Cid C.I.D. CID

The building, designed by Ruy Jervis d’Athouguia, Pedro Cid and Alberto Pessoa, emphasized the integration of art, architecture and nature.

From The Wall Street Journal ● Aug. 26, 2026

“Traveling offseason is one of the easiest ways seniors can stretch their travel budget,” advises Melissa Cid, a consumer savings expert at MySavings.com.

From MarketWatch ● Feb. 18, 2026

He is married to Lissette del Cid, with whom he has three daughters and three grandchildren.

From Barron's ● Dec. 24, 2025

Fresno City College student Domaris Cid is among the younger residents who see the chance to expand their educational options while still living at home.

From Los Angeles Times ● Feb. 8, 2024

I knew in that moment that the two of them, Smithy and Mara, were Cid.

From "The Many Assassinations of Samir, the Seller of Dreams" by Daniel Nayeri

Shani Abeysakara, the C.I.D. director who worked on the handful of human rights cases that made headway under the previous president, has found himself before the commission more than 40 times.

From New York Times ● Apr. 12, 2022

The C.I.D. put Jameel on a watch list.

From New York Times ● Jul. 2, 2020

Also in on the action is another Jury pal, Tom Brownell, a former C.I.D. operative.

From New York Times ● Nov. 1, 2019

After ten days of such secretive investigation, the C.I.D. had enough evidence to crack down.

From Time Magazine Archive

He became more circumspect in his work as a result of the visit from the second C.I.D. man.

From "Catch-22" by Joseph Heller

She urged protesters to let the CID complete its investigation instead of handing the case to the CBI.

From BBC ● Aug. 7, 2026

The CID boss cautioned families to verify lucrative job offers and educational opportunities abroad before taking them up.

From BBC ● Jul. 1, 2025

Kevin Moore, now-retired, was head of Sussex Police CID during the investigation.

From BBC ● Jul. 1, 2025

The following year the family were told the investigation had been closed but one CID officer urged Mary's daughter, Gina McGavin: "Don't give up hope."

From BBC ● Jan. 16, 2025

There was an inquiry, of course, and a week-long air search, and for a time the Tra Bong compound went crazy with MP and CID types.

From "The Things They Carried" by Tim O'Brien