| adjective | using the minimum of time or resources necessary for effectiveness “an economic use of home heating oil” |
| adjective | of or relating to an economy, the system of production and management of material wealth “economic growth” |
| adjective | avoiding waste “an economical meal” |
| economy | noun | the efficient use of resources |
| frugalness | noun | prudence in avoiding waste |
| frugality | noun | prudence in avoiding waste |