1. To cook something so it is almost boiling for a certain period of time: "The directions for the recipe said to put all the ingredients in a pot and simmer for 45 minutes."

"Simmer the stew for 30 minutes or until the sauce has thickened."

2. To be filled with a strong feeling that is difficult to control or to hide: "It was easy to see the customer simmer with anger when he couldn't get anyone to take his payment."

The season or time of the year that occurs between the seasons of spring and the fall, characterized by being warm or hot: "The girl said that she loves summer because there is no school and she can go to the beach every afternoon."

"Her children have wonderful memories of camping each summer over the years."