de·sid·er·a·ta (dĭ-sĭd'ə-rā'tə, -rä'-) n. Plural of desideratum.
de·sid·er·a·tum (dĭ-sĭd'ə-rā'təm, -rä'-) n.
pl.de·sid·er·a·ta (-tə) Something considered necessary or highly desirable: "The point is not that the artist has 'penetrated the character' of his sitter, that commonplace desideratum of portraiture"(Robert Hughes).
[Latin dēsīderātum, from neuter past participle of dēsīderāre, to desire; see desire.]