affinity Copy link Outline I. Relationship by marriageII. Natural connexion, or resemblance1. cognātĭo2. affīnĭtas (rare)III. Chem. t. t. • affinity: I. Relationship by marriage: affīnĭtas: P. Crassus bound himself closely to Galba by a., P. Crassus cum Galba affinitate sese devinxit, Cic.: they report that Latinus entered into an a. with Aeneas, Latinum a. cum Aenea junxisse tradunt, Liv. II. Natural connexion, or resemblance: 1. cognātĭo: all the virtues are connected together by a certain a., omnes virtutes c. quadam inter se conjunctae sunt, Cic.: a. of pursuits, c. studiorum, Cic.: Quint. 2. affīnĭtas (rare): the a. of the letters of the alphabet, af. literarum, Quint.: Gell. Phr.: the nature of the gods has no a. with our senses, natura deum longe remota sensibus ab nostris, Lucr.: you have not the slightest a. with the fairness and modesty of Ti. Gracchus, tu a Ti. Gracchi aequitate ac pudore longissime remotus es, Cic.: v. connexion. III. Chem. t. t.: a mutual tendency to combination: *affinitas.