Cats mostly meow at people, not at each other
Adult cats living wild rarely meow to one another. Kittens use it to call their mother, and most drop it as they grow up, switching to scent marks, tail signals and body posture with other cats.
Pet cats keep the kitten call and aim it squarely at us, because it works. Over years of living alongside people, many cats develop a small personal set of sounds their own household learns to read — which is why your cat's dinner meow may sound nothing like next door's.