A mention or citation of a source

The action of mentioning or alluding to something

उल्लेख

English Usage: She made a reference to the recent events in her speech.

Hindi Usage: उसने अपने भाषण में हाल की घटनाओं का उल्लेख किया।

The rate at which something occurs

The number of occurrences of a repeating event per unit of time

संख्या

English Usage: The doctor advised me to monitor my heart frequency.

Hindi Usage: डॉक्टर ने मुझे अपने दिल की संख्या की निगरानी करने के लिए कहा।