Usually special effects. a video or audio illusion in film or other media, created with computer-generated images, prosthetic makeup, pyrotechnics, etc.
Why Is The Date 11/11 Special?11 is a very odd number and has been subject to much interpretation over the ages. So why is it so special?
Origin of special effect
First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for special effects
films techniques used in the production of scenes that cannot be achieved by normal techniques
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012