Noun

(en noun)

Either of two parts that fit together, or complement one another.

''Those brass knobs and their hollow counterparts interlock perfectly

* {{quote-news, year=2012, date=November 7, author=Matt Bai, title=Winning a Second Term, Obama Will Confront Familiar Headwinds, work=New York Times citation

, passage=Mr. Obama never found a generational counterpart among conservatives in Congress like Paul D. Ryan or Eric Cantor; instead, there was a mutual animosity.}}

(legal) A duplicate of a legal document.

One which resembles another

One which has corresponding functions or characteristics.

* {{quote-news

, year=2011 , date=November 12 , author= , title=International friendly: England 1-0 Spain , work=BBC Sport citation , page= , passage=England's attacking impetus was limited to one shot from Lampard that was comfortably collected by keeper Iker Casillas, but for all Spain's domination of the ball his England counterpart Joe Hart was unemployed.}}

Noun

(en noun)

A specific form or variation of something.

* {{quote-book, year=1963, author=(Margery Allingham)

, title=(The China Governess) , chapter=3 citation , passage=‘[…] There's every Staffordshire crime-piece ever made in this cabinet, and that's unique. The Van Hoyer Museum in New York hasn't that very rare second version of Maria Marten's Red Barn over there, nor the little Frederick George Manning—he was the criminal Dickens saw hanged on the roof of the gaol in Horsemonger Lane, by the way—’}}

* {{quote-magazine, date=2013-03

, author=Frank Fish, George Lauder , title=Not Just Going with the Flow , volume=101, issue=2, page=114 , magazine=(American Scientist) citation , passage=An extreme version of vorticity is a vortex . The vortex is a spinning, cyclonic mass of fluid, which can be observed in the rotation of water going down a drain, as well as in smoke rings, tornados and hurricanes.}}

A translation from one language to another.

(obsolete) The act of translating, or rendering, from one language into another language.

An account or description from a particular point of view, especially as contrasted with another account.

(computing) A particular revision (of software, firmware, CPU, etc.).

(medicine) A condition of the uterus in which its axis is deflected from its normal position without being bent upon itself. See anteversion and retroversion.

(ophthalmology) An eye movement involving both eyes moving synchronously and symmetrically in the same direction.

(obsolete, or, medicine) A change of form, direction, etc.; transformation; conversion.

* Francis Bacon

The version of air into water.