mid-15c., "beneficial," also "valid, effective, capable of producing the desired effect," from avail + -able. Meaning "at one's disposal, capable of being made use of" is recorded from 1827. Related: Availably.
kept a fire extinguisher available
much information is available through computers
available in many colors
the list of available candidates is unusually long
he was available and willing to accompany her
he was not available for comment
the house is available after July 1