Rerun/ˈriːrʌn/ Definition 1 of 3Pro Tip 1/3TV Schedule Reruns are common in non-peak TV hours when fewer people watch TV. Late at night, you're more likely to find reruns on TV. Pro Tip 2/3Nostalgic Appeal Old TV show reruns can create a sense of nostalgia. Watching reruns of 'Friends' reminds me of the 90s. Pro Tip 3/3Cost-Effective Reruns are often used by networks to fill time slots cheaply. Reruns of classic shows are less expensive than making new episodes.