W3 [ˈklæsıkəl] adj
[Date: 1500-1600; : Latin; Origin: classicus; CLASSIC1]
1.) belonging to a traditional style or set of ideas
classical ballet/dance etc
the classical theory of relativity
2.) relating to music that is considered to be important and serious and that has a value that continues for a long time
classical music/musician/composer etc
a leading classical violinist
a classical repertoire
3.) relating to the language, literature etc of Ancient Greece and Rome
classical literature
a classical scholar
classical mythology
4.) also classic
typical of a particular thing or situation
the classical argument against democracy
>classically [-kli] adv
a classically trained singer
Classically, infection appears in the lower jaw.

Dictionary of contemporary English. 2013.