All 9 Uses of

discern
in
The Iliad by Homer (translated by: Lang, Leaf, & Myers)

And now behold I all the other glancing-eyed Achaians, whom well I could discern and tell their names; but two captains of the host can I not see, even Kastor tamer of horses and Polydeukes the skilful boxer, mine own brethren, whom the same mother bare.†
Book 3

discern = notice or understand something

Moreover I have taken from thine eyes the mist that erst was on them, that thou mayest well discern both god and man.†
Book 5 *

And Lykaon's glorious son made answer to him: "Aineias, counsellor of the mail-clad Trojans, in everything liken I him to the wise son of Tydeus; I discern him by his shield and crested helmet, and by the aspect of his horses; yet know I not surely if it be not a god.†
Book 5

Therefore do I now give ground myself and have bidden all the Argives likewise to gather here together; for I discern Ares lording it in the fray.†
Book 5

And of the twain Oileus' son, the swift-footed Aias, was the first to know the god, and instantly he spake to Aias, son of Telamon: "Aias, since it is one of the gods who hold Olympus, that in the semblance of a seer commands us now to fight beside the ships-not Kalchas is he, the prophet and sooth-sayer, for easily I knew the tokens of his feet and knees as he turned away, and the gods are easy to discern—lo, then mine own heart within my breast is more eagerly set on war and battle, and my feet beneath and my hands above are lusting for the fight."†
Book 13

Nay, if now beside the ships all the best of us were being chosen for an ambush—wherein the valour of men is best discerned; there the coward, and the brave man most plainly declare themselves: for the colour of the coward changes often, and his spirit cannot abide firm within him, but now he kneels on one knee, now on the other, and rests on either foot, and his heart beats noisily in his breast, as he thinks of doom, and his teeth chatter loudly.†
Book 13

discerned = noticed something that is not obvious

But white-armed Hera failed not to discern Anchises' son as he went through the press of men to meet the son of Peleus, and gathering the gods about her she spake among them thus: "Consider ye twain, Poseidon and Athene, within your hearts, what shall come of these things that are done.†
Book 20

discern = notice or understand something

But they who were with Atreus' son gathered all together, and the noise and clash of their approach aroused him; and he sate upright and spake a word to them: "Son of Atreus and ye other chiefs of the Achaians, first quench with gleaming wine all the burning so far as the fire's strength hath reached, and then let us gather up the bones of Patroklos, Menoitios' son, singling them well, and easy are they to discern, for he lay in the middle of the pyre, while the rest apart at the edge burnt-confusedly, horses and men.†
Book 23

But stand up ye too and look, for myself I discern not certainly, but the first man seemeth to me one of Aitolian race, and he ruleth among Argives, the son of horse-taming Tydeus, stalwart Diomedes.†
Book 23

Definition:

to notice or understand something -- often something that is not obvious