n. Any unit of cultural information, such as a practice or idea, that is transmitted verbally or by repeated action from one mind to another.n. A self-propagating unit of cultural evolution having a resemblance to the gene (the unit of genetics).n. A quiz or survey that is copied from one webpage or online journal to another, each participant filling in his or her personal answers.n. A thought, idea, joke, or concept that spreads online, often virally. Can be in the form of an image, a video, an email, an animation, or music.