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

“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

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

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

Though she hadn’t said it, the name Cid rang in my ears.

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