Meaning

• Diligent inquiry or examination to seek or revise facts, principles, theories, applications, etc.; laborious or continued search after truth.

  "The research station that houses Wang and his team is outside Lijiang, a city of about 1.2 million people."

• A particular instance or piece of research.

Meaning

• To search or examine with continued care; to seek diligently.

• To make an extensive investigation into.

• To search again.