Noun

(obsolete) Suitableness.

(uncountable) The quality or state of being able; capacity to do; capacity of doing something; having the necessary power.

*{{quote-magazine, date=2013-07-19, author=(Peter Wilby)

, volume=189, issue=6, page=30, magazine=(The Guardian Weekly) , title=[http://www.theguardian.com/education/2013/jul/01/education-michael-gove-finland-gcse Finland spreads word on schools] , passage=Imagine a country where children do nothing but play until they start compulsory schooling at age seven. Then, without exception, they attend comprehensives until the age of 16. Charging school fees is illegal, and so is sorting pupils into ability groups by streaming or setting.}}

The legal wherewithal to act.

*{{quote-magazine, date=2013-06-22, volume=407, issue=8841, page=68, magazine=(The Economist)

, title=[http://www.economist.com/news/finance-and-economics/21579860-g8-pledges-tackle-three-ts-t-time T time] , passage=The ability to shift profits to low-tax countries by locating intellectual property in them, which is then licensed to related businesses in high-tax countries, is often assumed to be the preserve of high-tech companies.}}

(archaic) Financial ability.

(uncountable) A unique power of the mind; a faculty.

* (rfdate) (Francis Bacon) (1561-1626)

Natural abilities are like natural plants, that need pruning by study -

(countable) A skill or competence in doing; mental power; talent; aptitude.

* (rfdate) (King James Bible) , (w) 11:29

Then the disciples, every man according to his ability , determined to send relief unto the brethren.

* (rfdate) (1800-1859)

The public men of England, with much of a peculiar kind of ability

* {{quote-news, year=2011, date=November 10, author=Jeremy Wilson, work=Telegraph

, title=[http://www.telegraph.co.uk/sport/football/teams/england/8882713/England-Under-21-5-Iceland-Under-21-0-match-report.html England Under 21 5 Iceland Under 21 0: match report] , passage=The most persistent tormentor was Alex Oxlade-Chamberlain, who scored a hat-trick in last month’s corresponding fixture in Iceland. His ability to run at defences is instantly striking, but it is his clever use of possession that has persuaded some shrewd judges that he is an even better prospect than Theo Walcott.}}

Noun

(en noun)

A tool for finding whether a surface is , or for creating a horizontal or vertical line of reference.

A distance relative to a given reference elevation.

Degree or amount.

* , chapter=17

, title= The Mirror and the Lamp , passage=This time was most dreadful for Lilian. Thrown on her own resources and almost penniless, she maintained herself and paid the rent of a wretched room near the hospital by working as a charwoman, sempstress, anything. In a moment she had dropped to the level of a casual labourer.}}

* {{quote-magazine, date=2013-05-17, author=George Monbiot, authorlink=George Monbiot

, title=Money just makes the rich suffer, volume=188, issue=23, page=19, magazine=(The Guardian Weekly) citation , passage=In order to grant the rich these pleasures, the social contract is reconfigured. […]  The public realm is privatised, the regulations restraining the ultra–wealthy and the companies they control are abandoned, and Edwardian levels of inequality are almost fetishised.}}

(computer science) Distance from the root node of a tree structure.

(gaming) One of several discrete segments of a game generally increasing in difficulty. Often numbered. Often, each level occupies different physical space (levels don't require any direct physical relationship to each other, e.g. vertically stacked, horizontally chained, etc).

(gaming) A numeric value that quantifies a character's experience and power.

A floor of a multi-storey building.

(British) an area of almost perfectly flat land.