A piece of work that has been given much critical praise, especially one that is considered the greatest work of a person's career. / A work of outstanding creativity, skill or workmanship.

A person with an extraordinary intellect or skill that is markedly superior to his or her peers. / A person responsible for the highest level of planning and execution of a major operation.

To act in the role of mastermind.

The position or authority of a master; dominion; command; supremacy; superiority. / Superiority in war or competition; victory; triumph; preeminence.

A piece done to prove possession of skill sufficient to be ranked a master. / A piece of quality, indicative of having been made by a master; a masterpiece. / (obsolete) An act of primary importance.

plural of mastercraftsman

A master of a specific trade or craft who may employ and train apprentices.

Executed in the manner of a master; showing competence and skill; masterful. / (usually derogatory, obsolete) Like a master; arbitrary; domineering, imperious.

(archaic) In a masterful manner; competently, masterfully.

In a masterful manner; in an extremely confident and competent manner.