To perceive by ear
listen to, hearken, hark, give attention, attend to, make out, auscultate, become aware of, catch, descry, apprehend, take in, eavesdrop, detect, perceive by the ear, overhear, take cognizance of, listen with both ears, keep one's ears open, have the sense of hearing, give ear to*, read loud and clear*, strain one's ears*, listen in*, devour someone's words*, get an earful*; see also listen 1.
To receive information aurally
overhear, eavesdrop, be advised, find out, catch, learn, have it on good authority, learn by general report, have an account, ascertain, descry, receive information, discover, gather, apperceive, be told, understand, hear of, be led to believe, be made aware of, be informed, learn by ear, hear say*, hear tell of*, get wise to*, get an earful*, get wind of*, get the signal*, sit in on*, tune in*; see also listen 2.
To hold a hearing
preside over, put on trial, summon to court; see try 3.
To perceive by ear, usually attentively:attend, hark, heed, listen. (Archaic) hearken. Idiom: give (or lend) one's ear. See sounds
To obtain knowledge or awareness of something not known before, as through observation or study:ascertain, determine, discover, find (out), learn. See teach
To receive (an idea) and take it into consideration:consider, entertain, think of. See thoughts