Security

In telecommunication, the term security has the following meanings:

1. A condition that results from the establishment and maintenance of protective measures that ensure a state of inviolability from hostile acts or influences.

2. With respect to classified matter, the condition that prevents unauthorized persons from having access to official information that is safeguarded in the interests of national security.

3. Measures taken by a military unit, an activity or installation to protect itself against all acts designed to, or which may, impair its effectiveness.

Source: from Federal Standard 1037C and adapted from the Department of Defense Dictionary of Military and Associated Terms and from the Department of Defense Dictionary of Military and Associated Terms

In finance, the term security has the following meaning:

Instruments traded in the capital market.

Securities include instruments such as stocks, bonds, mortgage bonds, and shares in investment funds. Banknotes, checks, and bills of exchange do not fall into this category.