what something looks like: the way a person or thing presents itself to the eye, and by extension a sight seen or a vision
This word names the visible side of things, what meets the eye. Its center is plain: the look of a face, a body, an object, the impression it makes on someone watching. From there it stretches in two natural directions. Looking outward, it becomes the act or experience of seeing itself, what a person takes in through the eyes. Looking upward, in the prophets, it becomes the word for an extraordinary sight, the vision a seer is shown.
The everyday use describes ordinary good or striking looks. Rachel, Joseph, David, Esther, and the cows of Pharaoh's dream are all introduced by how they appear. The priestly laws use the same word coldly and technically, asking only what a patch of skin or a wall looks like, deeper or no deeper than the surface, so that appearance becomes the basis of a verdict.
In Ezekiel and Daniel the word does its heaviest work. There the prophet keeps reaching for it because he is straining to report something at the edge of sight: the appearance of fire, the appearance of a man, the appearance of the likeness of the glory of the LORD. The repeated hedging is deliberate. He is telling us he saw a real sight while admitting that words can only reach its outward look, not its substance.
The senses are one word, not three unrelated words, because they all answer a single question: how did it look, what was seen? The shift is in what is being looked at, an ordinary face, the field of vision itself, or a holy spectacle, not in the meaning of the word.