What is the definition of economics?

Answer 1

To manage with economy; to use with prudence; to expend with frugality; as, to economize one's income., To be prudently sparing in expenditure; to be frugal and saving; as, to economize in order to grow rich.

Answer 2

All the activity's that people do to earn a living are part of a system is called the economy.
economic activity which is concerned money or wealth

Answer 3

Economics is the branch of social science that deals with the production and distribution and consumption of goods and services and their management,

(see related questions)

(used with a singular verb) the science that deals with the production, distribution, and consumption of goods and services, or the material welfare of humankind. 2. (used with a plural verb) financial considerations; economically significant aspects: What are the economics of such a project?

Just to add to your knowledge: The word economics comes from a greek word Oikou-Nomos or O'konomia
The definition of the word economics is "the branch of knowledge concerned with the production, consumption, and transfer of wealth."