What does millet mean in cooking?

millet means: It is a small round grain that can be boiled into flour or ground into flour. It doesn’t contain gluten. (in Cooking Dictionary)

What else does millet mean?

One of many annual grasses that have small grains and are used for livestock feed or birdseed. (in Merlin Dictionary)

Any of these crops can produce grains. (in Merlin Dictionary)