Noun
a second confirming signature endorsing a document already signed
Source: WordNetA countersignature by the head of government is, nevertheless, required. Source: Internet
Article 115, para. 2 In accordance to Poland's parliamentary system, most official acts of the presidency require the prime minister's countersignature in order to become valid. Source: Internet
Ludwikowski, p. 14 The executive branch could select and organize cabinets (with the Sejm's consent), be responsible to the ministries for their duties, and require the countersignature of ministers for all official acts. Source: Internet