optical illusion

noun

Definition of optical illusion

:illusion 2a(1)

Examples of optical illusion in a Sentence

  1. The closer building looks larger than the farther one, but it's just an optical illusion. The two buildings are actually the same size.

First Known Use of optical illusion

1763


OPTICAL ILLUSION Defined for English Language Learners

optical illusion

noun

Definition of optical illusion for English Language Learners

  • : something that looks different from what it is : something that you seem to see but that is not really there


OPTICAL ILLUSION Defined for Kids

optical illusion

noun

Definition of optical illusion for Students

:something that looks different from what it actually is

Medical Dictionary

optical illusion

noun

medical Definition of optical illusion

:visual perception of a real object in such a way as to misinterpret its actual nature

Learn More about optical illusion


Seen and Heard

What made you want to look up optical illusion? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

readily predictable

Get Word of the Day daily email!

Test Your Vocabulary

The Exceptions Quiz III

  • one-green-toy-robot-amidst-many-red-toy-robots
  • Which of these words does not mean "nonsense"?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!