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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.

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.
C.I.D. 3 American  

abbreviation

  1. Criminal Investigation Department of Scotland Yard.

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of C.I.D.

First recorded in 1900–05

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“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

Skylie Cid led the team in touchdowns as a freshman.

From Los Angeles Times • Aug. 11, 2025

Glendale Police Chief Manny Cid called the situation “frustrating” in a statement, considering that Martinez Vargas had been arrested just weeks after his previous arrest.

From Los Angeles Times • May 23, 2024

“So all that talk of Cid was nothing. You just wait for people to have accidents?”

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

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.