Assortative mating is a nonrandom mating pattern in which individuals with similar genotypes and/or phenotypes mate with one another more frequently than would be expected under a random mating pattern. For example, it is common for individuals of similar body size to mate with one another. Less commonly, in negative assortative mating (also known...
in human genetics, a statement of the frequency at which individuals mate with persons of similar phenotype or, conversely, with persons of ... [1 related articles]
The mating of cats (individuals) with similar phenotypes.
Selection of a mate with preference for (or aversion to) a particular genotype, i.e., nonrandom mating. ... Synonym: nonrandom mating. ... (05 Mar 2000) ... 
a mating scheme that relies on the pairing of unrelated individuals with similar phenotypes to obtain consistency of type and reinforce desirable traits.
Type: Term Definitions: 1. selection of a mate with preference for (or aversion to) a particular genotype, nonrandom mating. Synonyms: nonrandom mating
[n] - mating of individuals having more traits in common than likely in random mating
The mating of a given genotype mates with another genotype at a frequency disproportionate to that expected from random encounter 
noun mating of individuals having more traits in common than likely in random mating
the reproductive pairing of individuals that have more traits in common than would likely be the case if mating were random (contrasted with disassortative mating). Cf.