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Affinity (noun) A natural attraction or feeling of kinship to a person or thing. 
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Affinity (noun) A family relationship through marriage of a relative (e.g. sister-in-law), as opposed to consanguinity (e.g. sister). 
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Affinity (noun) A kinsman or kinswoman of a such relationship; one who is affinal. 
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Affinity (noun) The fact of and manner in which something is related to another. 
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Affinity (noun) Any romantic relationship. 
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Affinity (noun) Any passionate love for something. 
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Affinity (noun) biological populations; resemblances that suggest that they are of a common origin, type or stock. 
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Affinity (noun) structural resemblances between minerals; resemblances that suggest that they are of a common origin or type. 
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Affinity (noun) An attractive force between atoms, or groups of atoms, that contributes towards their forming bonds 
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Affinity (noun) The attraction between an antibody and an antigen 
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Affinity (noun) tendency to keep a task running on the same processor in a symmetric multiprocessing operating system to reduce the frequency of cache misses 
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Affinity (noun) An automorphism of affine space. 
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Kin (noun) Race; family; breed; kind. 
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Kin (noun) Persons of the same race or family; kindred. 
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Kin (noun) One or more relatives, such as siblings or cousins, taken collectively. 
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Kin (noun) Relationship; same-bloodedness or affinity; near connection or alliance, as of those having common descent. 
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Kin (noun) Kind; sort; manner; way. 
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Kin (adjective) Related by blood or marriage, akin. Generally used in “kin to”. “It turns out my back-fence neighbor is kin to one of my co-workers.” 
 
					