Noun

(en noun)

A possible, usually negative, outcome, e.g., a danger.

* Macaulay

the imminent and constant risk of assassination, a risk which has shaken very strong nerves

* 2006 , BBC News'' website, ''Farmers warned over skin cancer read at [http://news.bbc.co.uk/1/hi/northern_ireland/4764525.stm] on 14 May 2006

There was also a "degree of complacency" that the weather in the country was not good enough to present a health risk .

* {{quote-magazine, date=2013-06-22, volume=407, issue=8841, page=76, magazine=(The Economist)

, title= Snakes and ladders , passage=Risk is everywhere. From tabloid headlines insisting that coffee causes cancer (yesterday, of course, it cured it) to stern government warnings about alcohol and driving, the world is teeming with goblins. For each one there is a frighteningly precise measurement of just how likely it is to jump from the shadows and get you.}}

The likelihood of a negative outcome.

* 2006', Trever Ramsey on ''BBC News'' website, ''Exercise 'cuts skin cancer '''risk' read at [http://news.bbc.co.uk/1/hi/health/4764535.stm] on 14 May 2006

Taking regular exercise, coupled with a healthy diet, reduced the risk of several types of cancer.

* {{quote-magazine, date=2012-01, author=Stephen Ledoux, volume=100, issue=1, page=60

, magazine= , title= Behaviorism at 100 , passage=Becoming more aware of the progress that scientists have made on behavioral fronts can reduce the risk that other natural scientists will resort to mystical agential accounts when they exceed the limits of their own disciplinary training.}}

The potential (conventionally negative) should it occur.

* 2002', Decisioneering Inc website, ''What is '''risk ? read at [http://www.decisioneering.com/risk-analysis.html] on 14 May 2006

If there is a 25% chance of running over schedule, costing you a $100 out of your own pocket, that might be a risk' you are willing to take. But if you have a 5% chance of running overschedule, knowing that there is a $10,000 penalty, you might be less willing to take that ' risk .

Noun

(en noun)

A confrontation; a dare.

# An instigation or antagonization intended to convince a person to perform an action they otherwise would not.

#*{{quote-magazine, date=2013-11-30, volume=409, issue=8864, magazine=(The Economist), author=Paul Davis

, title= Letters: Say it as simply as possible , passage=Congratulations on managing to use the phrase “preponderant criterion” in a chart (“ On your marks”, November 9th). Was this the work of a kakorrhaphiophobic journalist set a challenge by his colleagues, or simply an example of glossolalia?}}

# A bid to overcome something.

#* {{quote-news, year=2012, date=May 5, author=Phil McNulty, work=BBC Sport

, title= Chelsea 2-1 Liverpool , passage=For Liverpool, their season will now be regarded as a relative disappointment after failure to add the FA Cup to the Carling Cup and not mounting a challenge to reach the Champions League places.}}

# (sports) An attempt to take possession; a tackle

#* {{quote-news, year=2011, date=October 1, author=Saj Chowdhury, work=BBC Sport

, title= Wolverhampton 1-2 Newcastle , passage=Argentine midfielder Jonas Gutierrez added a superb second when he surged past four challenges to fire in low.}}

# A summons to fight a duel; also, the letter or message conveying the summons.

# The act of a sentry in halting a person and demanding the countersign, or (by extension) the action of a computer system demanding a password, etc.

A difficult task, especially one that the person making the attempt finds more enjoyable because of that difficulty.

(label) A procedure or action.

# (legal, rare) A judge's interest in the result of the case for which he or she should not be allowed to sit the case, e.g. a conflict of interest.

# The act of appealing a ruling or decision of a court of administrative agency.

# The act of seeking to remove a judge, arbitrator or other judicial or semi-judicial figure for reasons of alleged bias or incapacity.

# (label) An exception to a person as not legally qualified to vote. The challenge must be made when the ballot is offered.

(label) The opening and crying of hounds at first finding the scent of their game.