adequate (adj.)

1610s, "equal to what is needed or desired, sufficient," from Latin adaequatus "equalized," past participle of adaequare "to make equal to, to level with," from ad "to" (see ad-) + aequare "make level," from aequus "equal, even" (see equal (adj.)). The sense is of being "equal to what is required." It shares duty with enough, depending on the subject. With a slightly disparaging tinge, "mediocre, just good enough," by 1900. Related: Adequateness.

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Definitions of adequate

adequate (adj.)
having the requisite qualities or resources to meet a task;
her training was adequate
she had adequate training
she was adequate to the job
Synonyms: equal
adequate (adj.)
sufficient for the purpose;
an adequate income
the food was adequate
Synonyms: enough
adequate (adj.)
about average; acceptable;
more than adequate as a secretary
Synonyms: passable / fair to middling / tolerable