W: (adj) economic [Related to: economy] (concerned with worldly necessities of life (especially money)) "he wrote the book primarily for economic reasons"; "gave up the large house for economic reasons"; "in economic terms they are very privileged"
W: (adj) economical [Related to: economy] (using the minimum of time or resources necessary for effectiveness) "an economic use of home heating oil"; "a modern economical heating system"; "an economical use of her time"
W: (v) economize [Related to: economy] (spend sparingly, avoid the waste of) "This move will save money"; "The less fortunate will have to economize now"
W: (v) economize [Related to: economy] (use cautiously and frugally) "I try to economize my spare time"; "conserve your energy for the ascent to the summit"