adagio
Concise Oxford English Dictionary © 2008 Oxford University Press:
adagio /əˈdɑː(d)ʒɪəʊ/ Music
▶adverb & adjective in slow time. ▶noun (pl. adagios) an adagio passage.
– origin Ital., from ad agio ‘at ease’.
'adagio' also found in these Oxford entries:

