1. The main or principal use or purpose of something
The primary application of this software is data analysis.
A aplicação principal deste software é análise de dados.
2. In computing, the main program or software that performs the core function
The primary application runs in the background to monitor system performance.
A aplicação principal executa em segundo plano para monitorar o desempenho do sistema.
3. The first or most important implementation or use case
The primary application of the new technology is in medical diagnostics.
A aplicação principal da nova tecnologia é no diagnóstico médico.