Capable of being understood: an intelligible set of directions.
Capable of being apprehended by the intellect alone.
[Middle English, from Old French, from Latin intellegibilis, intelligibilis, from intellegere, to perceive; see intelligent.] in·tel'li·gi·bil'i·ty, in·tel'li·gi·ble·ness n., in·tel'li·gi·bly adv.
1382, "able to understand," from L. intelligibilis "that can understand, that can be understood," from intelligere (see intelligence). Sense of "capable of being understood" first recorded in Eng. 1601.