Adjective

(en adjective)

Fast, prompt, speedy.

* 1815 , , Emma , ch. 38,

Our coachman and horses are so extremely expeditious !—I believe we drive faster than any body.

(of a process or thing) Completed or done with efficiency and speed; facilitating speed.

* 1816 , , The Antiquary , vol. 1, ch. 7,

As they thus pressed forward, longing doubtless to exchange the easy curving line, which the sinuosities of the bay compelled them to adopt, for a straighter and more expeditious path, Sir Arthur observed a human figure on the beach.

* 1844 , , Barry Lyndon , ch. 14,

Now, there was a sort of rough-and-ready law in Ireland in those days, which was of great convenience to persons desirous of expeditious justice.

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.