(countable) Anything that seems to be something that it is not. / (countable) A misapprehension; a belief in something that is in fact not true. / (countable) A magician’s trick.

Under an illusion; deceived.

Subject to or pertaining to an illusion, often used in the sense of an unrealistic expectation or an unreachable goal or outcome.

plural of illusion

The quality of being illusive; deceptiveness; false show.

In a illusive fashion.

An image that is visually deceptive or misleading.

An optical illusion in which a white area takes on a pale tint of a thin, bright, intensely colored polygon surrounding it if the coloured polygon is itself surrounded by a thin, darker border.

An optical illusion where an edge between regions of the same shade causes them to be perceived as different shades.

The optical illusion resulting from the Thatcher effect.