affinity: [14] The abstract notion of ‘relationship’ in affinity was originally a more concrete conception of a border. The word comes, via Old French afinite, from the Latin adjective affinis, which meant literally ‘bordering on something’. It was formed from the prefix ad- ‘to’ and the noun finis ‘border’ (from which English also gets finish, confine, and define). => confine, define, finish, paraffin, refine