Grill/ɡrɪl/ Definition 1 of 4Pro Tip 1/3Outdoor Cooking Often used for outdoor settings, especially for barbecues and picnics. They gathered around the grill during the family picnic. Pro Tip 2/3Heat Source Understand 'grill' involves direct heat, usually from below. Make sure to preheat the grill before adding the meat. Pro Tip 3/3Cooking Marks Food cooked on a grill typically has distinct parallel lines or marks. The grilled chicken bore the classic grill marks.