「朝ご飯」 (asagohan) means "breakfast." It specifically refers to the first meal of the day, eaten in the morning. This is a common phrase to talk about morning meals. 「毎朝、パンとコーヒーが朝ご飯です。」 (Every morning, bread and coffee are my breakfast.)

一日の最初の食事のことです。朝に食べるご飯です。