avail + -able

able to be used or obtained; at someone's disposal:

«…に/…するのに» 利用可能な, 役立つ «for, to/to do» ; «…の種類で/場所で/…から» (容易に)入手可能な, 求める［得る］ことができる «in/in, at/from» (↔ unavailable)

e.g. refreshments will be available all afternoon

e.g. a slush fund available to universities.

(of a person) not otherwise occupied; free to do something:

〖be ～〗 〈人が〉(手がすいて)話す［会う］ことができる, 体があいて(free)

e.g. the nurse is only available at certain times

e.g. the minister was not available for comment.

informal not currently involved in a sexual or romantic relationship:

｟くだけて｠ 〈人が〉交際相手のいない, 恋人募集中の; 口説きやすい

e.g. the larger the pool of available singles the greater your chance of finding someone special

e.g. do you think he's available?

availableness noun

availably adverb

late Middle English (in the senses ‘effectual, serviceable’ and ‘legally valid’): from avail + -able. The sense ‘at someone's disposal’ dates from the early 19th century.