Noun

The extent to which time is well used for the intended task.

The efficiency of the planning department is deplorable.

* {{quote-news

, year=2012 , date=September 7 , author=Phil McNulty , title=Moldova 0-5 England , work=BBC Sport citation , page= , passage=The display and result must be placed in the context that was it was against a side that looked every bit their Fifa world ranking of 141 - but England completed the job with efficiency to record their biggest away win in 19 years.}}

(dated) The quality of producing an effect or effects.

* Hooker

The manner of this divine efficiency being far above us.

The extent to which a resource, such as electricity, is used for the intended purpose; the ratio of useful work to energy expended.

The efficiency of this loudspeaker is 40%.

(United States) A one-room apartment.

I have an efficiency available June through July.

fully-furnished efficiencies

Noun

(wikipedia safety)

The condition or feeling of being safe; security; certainty.

If you push it to the limit, safety is not guaranteed.

(mechanics) A mechanism on a weapon or dangerous equipment designed to prevent accidental firing.

Be sure that the safety is set before proceeding.

(American football) An instance of a player being sacked or tackled in the end zone, or steps out of the end zone and off the field, resulting in two points for the opposite team.

''He sacked the quarterback in the end zone for a safety .

(American football) Any of the defensive players who are in position furthest from the line of scrimmage and whose responsibility is to defend against passes as well as to be the tacklers of last resort.

The free safety made a game-saving tackle on the runner who had broken past the linebackers.

Preservation from escape; close custody.

* Shakespeare

Imprison him, / Deliver him to safety ; and return.