1. In film and video post-production, a transition between two shots in which the first gradually fades out as the second is fading in, so that they overlap. This typically signifies the passage of time. Compared to a cut, the relative infrequency of its use makes it a marked transition, and it can generate connotations of femininity: see gendered editing.
2. (cross-fade) In audio post-production, the mixing of two sound sources together by increasing the volume of the incoming source before the mix and reducing the volume of the outgoing source after the mix.