1. [n]  (genetics) the process of locating genes on a chromosome
2. [n]  a function such that for every element of one set there is a unique element of another set

MAPPING is a 7 letter word that starts with M.

function

1. Determining the physical location of a gene or genetic marker on a chromosome. (See Continuous map, Genetic map, Physical map)
3. drawing a map showing the physical features of a community; usually an early step in a field project.