Sufficient to satisfy a requirement or meet a need. See Synonyms at sufficient.
Barely satisfactory or sufficient: The skater's technique was only adequate.
[Latin adaequātus, past participle of adaequāre, to equalize : ad-, ad- + aequāre, to make equal, from aequus, equal.] ad'e·qua·cy (-kwə-sē), ad'e·quate·ness n., ad'e·quate·ly adv.