concerto gros·so \ ̷ ̷| ̷ ̷ ̷ ̷ˈgrō(ˌ)sō also -rȯ-\noun (pluralconcerti gros·si \-(ˌ)sē, -_si\) Etymology: Italian, literally, big concerto : an orchestral composition of the Baroque period with a small group of solo instruments contrasting with the full orchestra