
1) Chamber music composition 2) Composition by George Enescu
Found on
https://www.crosswordclues.com/clue/decet

Latin, meaning: it is seemly, comely, suitable, proper
Found on
http://archives.nd.edu/ddd.htm
[music] In music, a decet—sometimes dectet, decimette, or even tentet (Gerhart, 2005)—is a composition which requires ten musicians for a performance, or a musical group that consists of ten people. The corresponding German word is Dezett, the French is dixtuor. Unlike some other musical ensembles such as the string quartet, there is no...
Found on
http://en.wikipedia.org/wiki/Decet_(music)

it is seemly, comely, suitable, proper.
Found on
https://www.math.ubc.ca/~cass/frivs/latin/latin-dict-full.html
No exact match found.