Webster's English Dictionary

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affinity

Cross references:
  1. consanguinity          2. attraction             3. likeness              
  
af.fin.i.ty \*-'fin-*t-e-\ n [ME affinite, fr. MF or L; MF afinite`, fr. L 
   affinitas, fr.] affinis bordering on, related by marriage, fr. ad- + finis 
   end, border 1: relationship by marriage  2a: sympathy marked by community 
   of interest : KINSHIP  2b: ATTRACTION; esp : an attractive force between 
   substances  or particles that causes them to enter into and remain in 
   chemical combination 2c: a person esp. of the opposite sex having a 
   particular attraction  3a: causal connection or relationship : RESEMBLANCE  
   3b: a relation between biological groups involving resemblance in the whole 
    plan of structure and indicating community of origin