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Counterpart vs Complementary - What's the difference?

counterpart | complementary |

As nouns the difference between counterpart and complementary

is that counterpart is either of two parts that fit together, or complement one another while complementary is a complementary colour.

As an adjective complementary is

acting as a complement.

counterpart

English

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.}}

    Synonyms

    * equivalent * opposite number * pendant

    complementary

    Adjective

    (en adjective)
  • Acting as a complement.
  • *
  • Using the terminology we intro-
    duced earlier, we might then say that black and white squares are in comple-
    mentary
    distribution on a chess-board. By this we mean two things: firstly,
    black squares and white squares occupy different positions on the board: and
    secondly, the black and white squares complement each other in the sense that
    the black squares together with the white squares comprise the total set of 64
    squares found on the board (i.e. there is no square on the board which is not
    either black or white).
  • (genetics) Of the specific pairings of the bases in DNA and RNA.
  • (physics) Pertaining to pairs of properties in quantum mechanics that are inversely related to each other, such as speed and position, or energy and time. (See also Heisenberg uncertainty principle.)
  • Usage notes

    * Complementary and complimentary are frequently confused and misused in place of one another.

    Derived terms

    * complementarily * complementarity * complementary angle * complementary colour * complementary distribution

    Noun

    (complementaries)
  • A complementary colour.
  • (obsolete) One skilled in compliments.
  • (Ben Jonson)