1.  mapping(n = noun.linkdef) function, map, mathematical function, single-valued function - (mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function);
is a kind of mathematical relation
has particulars: multinomial, polynomial, expansion, inverse function, kronecker delta, metric, metric function, transformation, isometry, operator, circular function, trigonometric function, threshold function, exponential, exponential function
Derived form verb map₆

2.  mapping(n = noun.act) chromosome mapping - (genetics) the process of locating genes on a chromosome;
is a kind of procedure, process
Derived form verb map₃

   A function such that for every element of one set there is a unique element of another set. [WordNet 1.5]

chromosome mapping