GNU Collaborative International Dictionary of English

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Found one definition

1.       
   ‖Errata (?), n. pl. [L.]
   1. Plural of erratum.  See Erratum.
   
   [1913 Webster]
   
   
   2. A list of errors together with the corrections for the errors, added as a separate page of a text prior to publication, or as a separate sheet inserted into a printed text; as, “the errata was added after the printing was finished.”.
   
   [PJC]
   
     Although originally  a plural word, the use of errata as a singular word in second sense has become common.
   
   [PJC]