Competent power; validity; efficacy / The quality of being available.

Such as one may avail oneself of; capable of being used for the accomplishment of a purpose. / Readily obtainable. / (law) Valid.

In an available manner

(obsolete) Profit; advantage.

(chiefly uncountable) The quality of being available. / (countable) That which is available.

(transitive, often reflexive) To turn to the advantage of. / (transitive) To be of service to. / (transitive) To promote; to assist.

Effect in achieving a goal or aim; purpose, use (now usually in negative constructions). / (now only US) Proceeds; profits from business transactions.

simple past tense and past participle of avail

present participle of avail

Efficacious.