a person who is active in party politics.
a seeker or holder of public office, who is more concerned about winning favor or retaining power than about maintaining principles.
a person who holds a political office.
a person skilled in political government or administration; statesman or stateswoman.
an expert in politics or political government.
a person who seeks to gain power or advancement within an organization in ways that are generally disapproved.

1580–90; < French politicien. See politic, -ian

nonpolitician, noun
self-politician, noun

4. Politician, statesman refer to one skilled in politics. These terms differ particularly in their connotations; politician is more often derogatory, and statesman laudatory. Politician suggests the schemes and devices of a person who engages in (especially small) politics for party ends or for one's own advantage: a dishonest politician. Statesman suggests the eminent ability, foresight, and unselfish patriotic devotion of a person dealing with (especially important or great) affairs of state: a distinguished statesman.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
politician (ˌpɒlɪˈtɪʃən)
1.  a person actively engaged in politics, esp a full-time professional member of a deliberative assembly
2.  a person who is experienced or skilled in the art or science of politics, government, or administration; statesman
3.  derogatory chiefly (US) a person who engages in politics out of a wish for personal gain, as realized by holding a public office

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1588, from politics (q.v.). Colloquial abbreviated form pol is attested from 1942. Alternative form politico (usually in a derogatory sense) is attested from 1630, from It. or Sp. politico, noun use of adj. meaning "political," from L. politicus (see politic).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The world is weary of statesmen whom democracy has degraded into politicians.
The world is wearied of statesmen whom democracy has degraded into politicians.
Diplomats make it their business to conceal the facts, and politicians
  violently denounce the politicians of other countries.
It is the kind of principle to which politicians delight to pay unctuous homage
  in words.
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