Availability

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Definition

Availability. Property of being accessible and usable on demand by an authorised entity. It is a metric which measures the percentage, normally computed over a periodical basis (such as a month) and net of planned or unplanned service downtimes of service coverage.

Examples

In procurement finance, it is the amount of money that is available for drawing to the assignor. This would be the value of all approved receivables multiplied by the pre-agreed prepayment percentage less any amounts already paid to the assignor.
In the context of Business Continuity it is indicating the presence of staff or organizational resources (buildings, applications) etc. in support of business functions

Reference

ISO/IEC 27000:2018