(n.) The quality or state of being similar; likeness; resemblance; as, a similarity of features.

accord addition adjunct affairs affiliation affinity alikeness alliance analogousness analogy approximation assemblage association balance bond closeness coincidence collation combination commensurability comparability comparableness comparativeness comparison connectedness connection contiguity contrariety correlation dealings deduction disjunction equivalence filiation homology intercourse interrelation intimacy junction liaison link linkage linking mutual attraction nearness parallel propinquity proportion proportionability proximity rapport ratio relatedness relation relations relationship resemblance semblance simile similitude sympathy synonymity tie tie-in union