concert of action

Main Entry: con·cert of action
Pronunciation: 'kän-s&rt-
1 : a theory in torts that imposes liability on all defendants who have committed tortious acts that contributed to the plaintiff's injury even though only one actually caused the injury —compare alternative liability at LIABILITY 2b
2 : a rule in criminal law that holds an aider and abettor liable for commission of a criminal act by the principal
NOTE: Concert of action does not apply where the crime requires more than one person for its commission.