A diagram used in quality management to display a detailed list of causes and effects of a problem and thus to decipher the root cause of a problem.

An uncut diamond. / (figuratively) A person whose goodness or other positive qualities are hidden by a harsh or unremarkable surface appearance.

A four-cornered part of a baseball field in which the corners are the three bases and the home plate.

plural of dial tone

A telephony signal, usually in the form of a sound, used to indicate that the telephone exchange is working, has recognized an off-hook, and is ready to accept a call.

plural of diamond cutter

(software engineering) A type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, and the relationships between the classes.

Used other than figuratively or idiomatically: see diamond, ring. / By extension, an engagement ring, usually one given by a man to a woman.

(chiefly historical) Someone skilled in dialectics: someone able to arrive at logical conclusions through reasoned argument.

Someone knowledgable about dialects.