In 2011, the European Commission (EC) adopted a Recommendation on the definition of a nanomaterial.  The Recommendation invites member states, European Union (EU) agencies, and economic operators to use the definition “in the adoption and implementation of legislation and policy and research programmes concerning products of nanotechnologies.”  The EC is now reviewing its Recommendation.  It has launched a targeted stakeholder consultation to update, test, and verify the preliminary findings of this comprehensive review, gathering further evidence and feedback from a wide range of stakeholders who have a role in application of the harmonized regulatory definition of nanomaterial in the…