A collection of individuals or things

A category or class of similar items

एक श्रेणी

English Usage: This group of animals is endangered.

Hindi Usage: इस जानवरों की श्रेणी संकटग्रस्त है।

The communication of disease from one person to another

The spontaneous spread of ideas or emotions

विचारों या भावनाओं का स्वतः प्रसार

English Usage: The contagion of enthusiasm was evident at the rally.

Hindi Usage: रैली में उत्साह का स्वतः प्रसार स्पष्ट था।