Availability

n.	1.	The quality of being available; availableness. He was . . . nominated for his availability. - Lowell.
	2.	That which is available.

Noun

1.

availability - the quality of being at hand when needed Synonyms: accessibility, availableness, handiness Antonyms: inaccessibility, unavailability - the quality of not being unavailable when needed

(system)

availability - The degree to which a system suffers degradation or interruption in its service to the customer as a consequence of failures of one or more of its parts. One of the components of RAS.

access, accessibility, actual presence, applicability, approachability, being here, being there, come-at-ableness, effectiveness, efficacy, efficiency, existence, functionality, getatableness, gettableness, helpfulness, hereness, immanence, immediacy, indwellingness, inherence, obtainability, obtainableness, occurrence, openness, operability, penetrability, perviousness, physical presence, practicability, practical utility, practicality, presence, procurability, procurableness, profitability, reachableness, securableness, serviceability, spiritual presence, thereness, ubiety, usability, use, usefulness, utility, utilizability, whereness