noun Physics, Optics.
a method for increasing the number of atoms or molecules occupying higher energy levels by irradiating them with light of the proper frequencies to raise them to those levels.
Our Favorite Viral Optical Illusions ExplainedRead more in this article about some frequently asked questions and fun facts related to our definitions.
Allusion vs. IllusionThe similar spellings and pronunciations of allusion and illusion can cause even seasoned writers to second-guess their choice of words. Today we will examine and clarify the differences between these two terms. An allusion is a reference, direct or implied, to something or someone. Allusions are often found in books, songs, TV shows, and movies. For instance, the title of Aldous Huxley’s classic novel Brave …
Origin of optical pumping
First recorded in 1950–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019