COUNTERPART
counterpart, similitude, twin
(noun) a duplicate copy
counterpart, opposite number, vis-a-vis
(noun) a person or thing having the same function or characteristics as another
Source: WordNet® 3.1
Etymology
Noun
counterpart (plural counterparts)
Either of two parts that fit together, or complement one another.
(legal) A duplicate of a legal document.
One which resembles another
One which has corresponding functions or characteristics.
(palaeontology) Either half of a flattened fossil when the rock has split along the plane of the fossil.
Synonyms
• equivalent
• homolog
• opposite number
• pendant
Verb
counterpart (third-person singular simple present counterparts, present participle counterparting, simple past and past participle counterparted)
Counterbalance.
Source: Wiktionary
Coun"ter*part` (koun"tr-prt`), n.
1. A part corresponding to another part; anything which answers, or
corresponds, to another; a copy; a duplicate; a facsimile.
In same things the laws of Normandy agreed with the laws of England,
so that they seem to be, as it were, copies or counterparts one of
another. Sir M. Hale.
2. (Law)
Definition: One of two corresponding copies of an instrument; a duplicate.
3. A person who closely resembles another.
4. A thing may be applied to another thing so as to fit perfectly, as
a seal to its impression; hence, a thing which is adapted to another
thing, or which suplements it; that which serves to complete or
complement anything; hence, a person or thing having qualities
lacking in another; an opposite.
O counterpart Of our soft sex, well are you made our lords. Dryden.
Source: Webster’s Unabridged Dictionary 1913 Edition