Real Dictionary

fade
verb: If memories, feelings, or possibilities fade, they slowly become less intense or less strong.
verb: If someone or something fades, for example, into the background, they become hardly noticeable or very unimportant.
verb: If someone's smile fades, they slowly stop smiling.
verb: When a coloured object fades or when the light fades it, it gradually becomes paler.
verb: When light fades, it slowly becomes less bright. When a sound fades, it slowly becomes less loud.
verb: When something that you are looking at fades, it slowly becomes less bright or clear until it disappears.

fade in American English
the act of fading
to become less distinct; lose color, brilliance, etc.
intransitive verb: to lose brightness or vividness of color
noun: an act or instance of fading
transitive verb: to cause to fade

fade in British English
noun: the act or an instance of fading
verb: to lose or cause to lose brightness, colour, or clarity