1. slow-motion movement or action
2. an effect using slow-motion photography or video techniques

adjective

1. moving or operating below usual or normal speed
2. designating a film or taped TV sequence in which the action is made to appear slower than the actual action by exposing more frames per second than is usual and projecting the film at normal speed or by filming or taping at normal speed and projecting or replaying at a lower than usual speed