- (rare) In such a way as to be an accessory; in an auxiliary manner, additionally.
1869, CI Hemans, A History of Mediaeval Christianity and Sacred Art in Italy, page 463:
- Besides these groups are introduced, accessorially, all the Fathers and Doctors whose writings maintain the Roman Church's doctrine of the Real Presence.
1916, AJ Beveridge, The Life of John Marshall, volume 3, page 625:
- English books unite in declaring that he, who councels, procures or aids treason, is guilty accessorially and solely in virtue of the common law principle [...].