1.Definition: avoiding waste

"An economical meal", "An economical shopper"

Related Adjective(s):frugal, scotch, sparing, stinting

2.Definition: of or relating to an economy, the system of production and management of material wealth

"Aspects of social, political, and economical life"

Related Adjective(s):economic

3.Definition: using the minimum of time or resources necessary for effectiveness

"A modern economical heating system", "An economical use of her time"

Related Adjective(s):economic