-며 means "and at the same time" and have two main usages. 1. used as meaning of "and, or" 이것은 책상이며 저것은 의자이다. This is a table and that is a chair 그녀는 노래며 연주며 모두 잘하는 음악가이다. She is a musician who are good at singing and playing. 2. used as meaning of "while, as, over, during, with" same to "-면서" 나는 신문을 보며(면서) 밥을 먹었다. I read newspaper and ate food at the same time. While reading newspaper, I ate food. 그것은 행복이며 기쁨이다. It is happiness and also pleasure.