Adjective

(-)

(of a person or enterprise) having been issued with a licence (by the required authority)

Only licensed exterminators can purchase rat poison in this state.

# (of a shop or restaurant) allowed to sell alcohol

The opening hours of licensed premises are restricted to prevent all-night drinking.

(of an activity) authorized by licence

Even licensed fishing has a major effect on the fish population in the river.

# (of a product) based on an existing piece of intellectual property and sold under licence.

Although they sell well, licensed video games are seldom critically acclaimed.

Adjective

(en adjective)

Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy.

* {{quote-magazine, title=A better waterworks, date=2013-06-01, volume=407, issue=8838

, page=5 (Technology Quarterly), magazine=(The Economist) citation , passage=An artificial kidney these days still means a refrigerator-sized dialysis machine. Such devices mimic

Using a particular proportion of available energy.

Causing effects; producing results.

* Wilson

The efficient cause is the working cause.