1. An original, reliable, and verifiable source of information, evidence, or documentation that can be traced back to its origin and is not a copy or secondary account
The historian relied on authentic sources such as original manuscripts and contemporary documents to write the biography.
O historiador se baseou em fontes autênticas, como manuscritos originais e documentos contemporâneos, para escrever a biografia.
2. Primary source material that comes directly from the time period or subject matter being studied, without intermediaries
The museum displayed authentic sources from the medieval period including letters and artifacts.
O museu exibiu fontes autênticas do período medieval, incluindo cartas e artefatos.