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See 4.2.2.2 Availability

Availability is the probability that a system will work as required when required during the period of a mission. The mission could be the 18-hour span of an aircraft flight. The mission period could also be the 3 to 15-month span of a military deployment. Availability includes non-operational periods associated with reliability, maintenance, and logistics.

Source: Availability

Availability means information should be consistently and readily accessible for authorized parties. This involves properly maintaining Hardware (H/W) and technical infrastructure and systems that hold and display the information.

Source: https://whatis.techtarget.com/definition/Confidentiality-integrity-and-availability-CIA