fadein

/ˈfeɪdˌɪn/
noun
  1. A gradual increase in the visibility of an image or audibility of a sound, used in film, television, and audio production.
    • The sound engineer added a fadein to the music so it wouldn't start too abruptly.
    • A fadein at the start of the video helps ease the viewer into the content.
    • The movie began with a slow fadein from black to a sunny beach scene.
Antonyms
What does "fadein" mean? | whatsthatwordmean | whatsthatwordmean