a person who shares or is associated with another in some action or endeavor; sharer; associate.
a person associated with another or others as a principal or a contributor of capital in a business or a joint venture, usually sharing its risks and profits.
a spouse; a husband or a wife.
the person with whom one cohabits in a romantic relationship: I'd like you to meet my partner, Sarah.
either of two people who dance together: my favorite partner in the waltz.
a player on the same side or team as another: My tennis partner was an excellent player.
partners, Nautical. a framework of timber round a hole in a ship's deck, to support a mast, capstan, pump, etc.
verb (used with object)
to associate as a partner or partners with.
to serve as the partner of.

1250–1300; Middle English partener, alteration of parcener by association with part

partnerless, adjective
nonpartner, noun
underpartner, noun

1. colleague, accessory, accomplice. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
partner (ˈpɑːtnə)
1.  an ally or companion: a partner in crime
2.  a member of a partnership
3.  one of a pair of dancers or players on the same side in a game: my bridge partner
4.  either member of a couple in a relationship
5.  to be or cause to be a partner (of)
[C14: variant (influenced by part) of parcener]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 13c., from O.Fr. parçener "joint heir," from parçon "partition," from L. partitionem (nom. partitio) "portion" (see partition). Form infl. by part (n.). The word may also represent O.Fr. part tenour "part holder." Partnership in the commercial sense is attested from c.1700.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
For decades, becoming a partner in a law or accounting firm was almost better
  than getting tenure at a university.
She wouldn't get it if you referred to your partner rather than your husband.
Crucial advice for future banding participants: before you grab the bird's
  body, be sure your partner has grabbed the head.
The perfect partner for fresh homemade mozzarella is homegrown tomatoes.
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