Definitions of economic:

• adjective:   financially rewarding

  Example: "It was no longer economic to keep the factory open"

• adjective:   concerned with worldly necessities of life (especially money)

  Example: "He wrote the book primarily for economic reasons"

• adjective:   of or relating to the science of economics

  Example: "Economic theory"

• adjective:   of or relating to an economy, the system of production and management of material wealth

  Example: "Economic growth"

• adjective:   using the minimum of time or resources necessary for effectiveness

  Example: "An economic use of home heating oil"