From the Latin for "agreeing", it describes 2 figures that coincide when superimposed
Figure 2.1 
Part of a page from the tenth edition of Linnaeus's Systema ..... when a Latin 
binomial, a name consisting of two parts (a genus term ...... superimposed on 
map of South America showing distributions of T. keyserlingi (aretes),... [DOC] [TLE] Authenticity and Authorship in the Computer-Mediated Acquisition of ... [PAR] Authenticity and authorship have been the two poles between which the teaching 
....