Definition of "trio"

I'm cooking crab cakes with arugula and mayonnaise, griddled lamb with rosemary potatoes and buttered spinach, then a trio of desserts.

2015, Kate Hardy, Bachelor at Her Bidding

These are exciting times for England and particularly for this group. Six of this side won the Under-17s European Championship in 2014 and the attacking trio from Everton and Liverpool – Ademola Lookman, Dominic Solanke and Calvert-Lewin – had an excellent tournament.

2017 June 11, Ben Fisher, “England seal Under-20 World Cup glory as Dominic Calvert-Lewin strikes”, in the Guardian‎

I love his music, but it is a bit disconcerting to realize that you could die in extreme old age and still only be familiar with a mere handful of the baryton trios.

2013, Simon Winder, Danubia, Picador, published 2014, page 281