The definition of a desideratum is a wish or desire.
An example of a desideratum is a woman's want to be a mother.
something needed and wanted
Origin of desideratumL, neuter of desideratus: see desiderate
Something considered necessary or highly desirable.
Origin of desideratumLatin dēsīderātum, from neuter past participle of dēsīderāre, to desire; see desire.