What is the meaning of Unicolor?

Of one color; monochromatic.

unicolor/unicolour, one-color/one-colour, monocolor/monocolour, monochromatic, monochrome

Of one colour.

All of the same colour.

unicolor/unicolour, one-color/one-colour, monocolor/monocolour, monochromatic, monochrome (having only one colour)

unicolored

unicolor/unicolour, one-color/one-colour, monocolor/monocolour, monochromatic, monochrome

Source: wiktionary.org