echo check definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
An error control technique in which a computer returns transmitted data to verify correct reception.
echo check - Computer Definition
In communications, an error checking method that retransmits the data back to the sending device for comparison with the original.