Echoing is acknowledging the receipt of commands by displaying them (in the echo area). Emacs never echoes single-character key sequences; longer key sequences echo only if you pause while typing them.

Echoing refers to acknowledging the receipt of commands by displaying them (in the echo area). Emacs never echoes single-character keys; longer keys echo only if you pause while typing them.

When the modem is in command mode, it can transmit characters it receives back to the computer. This is called echoing. For example, if you enter a modem command in a telecommunications application, your keystrokes appear in the application window if echoing is turned on. You use the En command to turn echoing on and off.

Reflecting sounds so as to create multiple echoes; as, a hotel with echoing halls.

(of sounds) repeating by reflection; "a hotel with echoing halls"

Echoing is a reflection of the transmitted signal from the receiving end, a visual method of error detection in which the signal from the originating device is looped back to that device so that it can be displayed.