What does "available" mean?

Available: Such as one may avail one's self of; capable of being used for the accomplishment of a purpose; usable; profitable; advantageous; convertible into a resource; as, an available measure; an available candidate. Struggling to redeem, as he did, the available months and days out of so many that were unavailable. Carlyle. Having no available funds with which to pay the calls on new shares. H. Spenser.