obtainable or accessible; capable of being made use of; at hand
2.
derogatory (US) politics suitable for public office, usually as a result of having an inoffensive character: Smith was a particularly available candidate
system 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. (2000-08-13)