1. A vast or considerable area, distance, or scope of something
The property has a large extension of land suitable for farming.
A propriedade tem uma extensão grande de terra adequada para agricultura.
2. A substantial continuation or addition to something existing
The new highway extension is quite large and will improve traffic flow.
A extensão grande da nova rodovia melhorará o fluxo de tráfego.
3. A broad range or scope, as in time, knowledge, or subject matter
His research covers a large extension of historical periods.
Sua pesquisa abrange uma extensão grande de períodos históricos.