Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “security”

security

noun  /sɪˈkjʊər·ɪ·t̬i/ us  

security noun (FREEDOM FROM RISK)

[U] freedom from risk and the threat of change for the worse : financial/job security

security noun (FREE FROM DANGER)

[U] social studies freedom from danger; safety: For security reasons, for the protection of the White House and the president, they felt it necessary to close the avenue. A convicted spy, he sold information that may have damaged our national security. [U] social studies Security is also the group of people responsible for keeping buildings or other areas safe: If anyone gives you trouble, just call security.

security noun (INVESTMENT)

[C usually pl] an investment in a company or in government debt that can be traded on the financial markets

security noun (MONEY)

[U] money you pay someone that can be legally used by that person if your actions cause the person to lose money, but that will be returned to you if it is not used: You have give the landlord an extra month’s rent as security when you sign the lease.
(Definition of security from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of security?
Add Cambridge dictionaries to your browser to your website

More American English definitions for “security”

Definitions of “security” in other dictionaries

Word of the Day

dawn on sb

If a fact dawns on you, you understand it after a period of not understanding it.

Word of the Day

Highly delighted, bitterly disappointed, ridiculously cheap: adverbs for emphasis.

by Liz Walter,
October 22, 2014
We often make adjectives stronger by putting an adverb in front of them. The most common ones are very and, for a stronger meaning, extremely: He was very pleased. The ship is extremely large. However, we don’t use very or extremely for adjectives that already have a strong meaning, for example fantastic,

Read More 

life tracking noun

October 20, 2014
the use of one or more devices or apps to monitor health, exercise, how time is spent, etc.

Read More