Whether someone or something can be accessed or used. 
Use availability in a sentence. LINK / CITE ADD TO WORD LIST. noun. The definition of availability is whether someone or something can be accessed or used. An example of availability is when a classmate can meet to discuss a project on a certain date. Definition of AVAILABILITY. 1. : the quality or state of being available. 2. : an available person or thing. Availability Meaning and Definition in Wikipedia. Availability is a term used in Information Security, to show that a system is running and reachable by those that are supposed to be able to use the system. Availability is sometimes expressed as a percentage of uptime, such as 99%. High availability is usually expressed as five nines - 99.999%. adjective. The definition of available is someone or something that can be found, used or accessed. 1  An example of an available option is a color that can be chosen for a car. 2  An example of available is a person who is free to attend a meeting.
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the meaning of availability