Step 1: Understanding the Concept:
Demographic indicators are used to measure the health, standard of living, and development of a society.
Step 2: Detailed Explanation:
Infant Mortality Rate (IMR) is specifically defined as the number of infants who die before reaching their first birthday, calculated per 1,000 live births in a given year.
It is considered a sensitive indicator of a country's healthcare system and nutritional status.
Birth Rate is the number of live births per 1,000 population.
Mortality Rate is the crude death rate per 1,000 population.
Life Expectancy is the average number of years a person is expected to survive.
Step 3: Final Answer:
The definition provided corresponds to the Infant Mortality Rate.