ACL – Definition & Meaning

ACL or Access Control List is a term that is commonly used in the field of computer networking and security. It is a set of rules or instructions that are used to control access to specific resources or services on a computer network. In this article, we will explore the definition and meaning of ACL, its origin, associations, synonyms, antonyms, and examples.


An Access Control List (ACL) is a set of rules that is used to control access to resources or services on a computer network. It is commonly used in computer networking and security to restrict access to specific resources or services based on user identity, network address, or other criteria.


The concept of Access Control List (ACL) was first introduced in the early 1970s, as a way to control access to resources on mainframe computers. Since then, it has evolved into a widely used security mechanism in computer networking.

Meaning in different dictionaries

According to the Oxford English Dictionary, ACL is defined as “a list of permissions attached to an object, specifying who can access it and what actions they can perform”.
The Merriam-Webster Dictionary defines ACL as “a list of users or groups that are authorized to access a particular system or resource”.


ACL is commonly associated with computer networking and security, and is used in various applications such as firewalls, routers, switches, and servers.


Some synonyms of ACL include access control, permission list, authorization list, and security policy.


There are no direct antonyms of ACL, but some related terms that are opposite in meaning include unrestricted access, open access, and public access.

The same root words

The same root words as ACL include access, control, list, and authorization.

Example Sentences

  1. The network administrator created an ACL to restrict access to sensitive data.
  2. The firewall was configured to allow only authorized users, based on the ACL.
  3. The ACL was updated to include new users and remove outdated permissions.
  4. The router was configured with an ACL to block traffic from certain IP addresses.
  5. The security policy included an ACL to control access to the company’s financial data.
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