To form a contrast.
To set in opposition in order to show the difference or differences between.
Something that is opposite of or strikingly different from something else.
A control on a television, etc, that adjusts the amount of contrast in the images being displayed.
Antithesis.
is a substance used to increase the contrast of structures or fluids within the body in medical imaging.
The degree of this difference.
A difference between two objects, people or concepts.
To reflect back (a sound).
To reflect off a surface and return.
To repeat (another's speech, opinion, etc.).
To repeat its input as input to some other device or system.
To give the echo signal, informing one's partner about cards one holds.
An individual discussion forum using the echomail system.
An utterance repeating what has just been said.
The displaying on the command line of the command that has just been executed.
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 signalled for trumps.
A reflected sound that is heard again by its initial observer.
An antisemitic punctuation symbol or marking, ((( ))), placed around a name or phrase to indicate the person is Jewish or the entity is controlled by Jewish people.
A device in verse in which a line ends with a word which recalls the sound of the last word of the preceding line.
A signal showing the number held of a plain suit when a high card in that suit is led by one's partner.
Sympathetic recognition; response; answer.