A sound reflected from an opposing surface and repeated to the ear of a listener; repercussion of sound; repetition of a sound.

A wood or mountain nymph, regarded as repeating, and causing the reverberation of them.

A signal, played in the same manner as a trump signal, made by a player who holds four or more trumps (or as played by some exactly three trumps) and whose partner has led trumps or signaled for trumps.

A signal showing the number held of a plain suit when a high card in that suit is led by one's partner.

A reference to an echomail conference. For example, "This echo has too many messages." Also used to decribe when a bulletin board or your terminal program sends back the characters that you type.

Echoes text or values to standard out. Working exmaple: echo "Hello World!" This would echo Hello World! to your screen

A host computer's retransmission of characters back to the sending device.

Local echo ON causes all transmitted data to be sent to the screen of the sending computer. Remote echo ON causes everything that the remote computer (the one you are communicating with) transmits to be duplicated on your computer's screen. See Duplex.

Displays messages, or turns command echoing on or off.

See Command Echoing.

displays its arguments to standard output. Sometimes this is a built-in shell command replacing the external echo command.

prints a line of text, it is a shell builtin command.

The time elapsed between pulse emission and reception that is used to determine target position in an ultrasonic proximity sensor.

Serenade which directly targets a halo.

In radar, a general term for the appearance of the radar energy returned from a target.

Measures the total round trip latency and other statistics and errors from the source router to the target device.

an ultrasound exam used to evaluate the size, thickness, shape, and movement of the heart muscle

an ultrasound of the heart, a noninvasive and painless procedure

a series of ultrasound images displaying the structure, motion and blood-flow of the heart and great vessels

a test that uses ultrasound waves to record images of your heart

European Chart Hub Operations, or ECHO, is an international project started in April 1996 and scheduled to last for two years. The aim is to demonstrate the provision of a complete distribution and update service for Electronic Navigational Charts (ENC). The activities are partly funded by the European Commission under their Transport Telematics Applications Programme, and the service is intended to be fully compliant with the International Hydrographic Organisation's (IHO) Wordwide Electronic Navigational Chart Database (WEND).

European Commission Host Organization [Internet

the European Commission Humanitarian Office

European Commission Humanitarian Aid Office

Elder Cottage Housing Opportunity. A separate, self-contained unit designed for temporary installation in the side or backyard of an adult child's home. (see also "Granny Flats")

Ecology Culture History and Opportunities

Elder Cottage Housing Opportunity [housing units

Name of one of the first generation of Russian nuclear submarines. Also a return ping from a contact hit with active sonar.

a message that returns to you, meaning you'll never forget to renew your license ever again

See return loss.

Designator for the letter "E" in the International Phonetic Alphabet.

military phonetic for the letter 'E'

Military phonetic term for the latter E

A member's only bulletin board service similar to the Well (see below) but based in New York City.

Erie City Housing Organization

Echo is a glamorous nightspot located at 79 Monmouth Street in Red Bank, New Jersey. The club is much like a New York City lounge. It features drinks and tapas.

Echo is the tenth studio album by United States rock band Tom Petty and the Heartbreakers, first released in April 1999 (see 1999 in music). The album reached #10 on the Billboard 200 aided by the singles "Free Girl Now", "Swingin'" and "Room At The Top" which hit #5, #17 and #19 respectively on Billboard's Modern Rock Tracks in 1999. The album was the last to feature acclaimed producer Rick Rubin.

Echo is a studio album released by jazz pianist Dave Burrell. It was first released as an LP album on August 13, 1969 by BYG Actuel. It was re-released twice, first again on LP by Get Back Records in 2001 before finding its way to compact disc in 2004 via Sunspots Records.

Echo is a 2003 short film, written and directed by Tom Oesch, starring Haven Pell, Sean Le and Armand Kirshman.