The distance between one peak or crest of a wave of light, heat, or other energy and the next corresponding peak or crest.
On the same wavelength Informal In complete accord; in harmony: "a fluid ... production in which author, director, designer and cast seem to be working on the same wavelength” ( James Lardner).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.