I have three cats, all are VERY vocal but none of them make a noise I would classify as a meow.
Cat 1 makes a honking noise like a goose and it's usually to tell you to stroke him or a general hello.
Cat 2 makes a high pitched eeeeeeeh noise that sounds a bit like a babies cry and it's to get you to follow her around the house and offer her things while she turns her nose up at them.
Cat 3 trills and purrps and makes a noise that sounds like kkaaaaakoooooow and it's usually because she wants to play or be brushed.
Do your cats meow?