masterwork

Noun

 * 1) A piece done to prove possession of skill sufficient to be ranked a master.
 * 2) A piece of quality, indicative of having been made by a master; a masterpiece.
 * 3)  An act of primary importance.
 * 4)  A main drain or irrigation channel.

Translations

 * Esperanto: majstroverko
 * Finnish: mestarityö, mestarinäyte
 * French:
 * German:
 * Icelandic: meistaraverk
 * Italian:
 * Polish: