1) An episode in a fugue 2) An extended fugue subject 
Andamento is an Italian musical term used to refer to a fugue subject of above average length. ==Definition== The term was coined by G.B. Martini in the second volume of his work Esemplare, ossia Saggio fondamentale pratico di contrappunto (1775), which also featured the terms attaco and soggetto to refer to short and average-length fugue themes, ...
used to refer to a fugue subject of above-average length
an extended fugue subject. · an episode in a fugue.