Two alleles are in linkage disequilibrium with each other:
if an individual is more likely to pass down those two alleles together.
if they are non-randomly associated in a population.
if they are nearby on the same chromosome.
if they are linked.

If they are non-randomly associated in a population

Explanation:

Haplotypes are a set of linked genes of one genome.Linkage disequilibrium occurs when these haplotypes do not occur at the expected genotypic frequencies. Genotypic frequencies in a population are the number of people with a specific genotype divided by the total number people.

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