What is the meaning of Dither?

To tremble, shake, or shiver with cold.

To be uncertain or unable to make a decision about doing something.

To do something nervously.

To render an approximation of (an image or graphic) by using dot patterns to simulate the appearance of colors or shades not in the system palette.

To intentionally add noise to a signal to randomize errors.

The state of being undecided.

A form of noise which is intentionally applied to randomize errors which occur in the processing of both digital audio and digital video data.

The use of dot patterns to approximate colors not available in the palette.

Source: wiktionary.org