Definition of relatum in US English:

relatum

noun

  • 1Chiefly Philosophy and Logic. Each of two or more terms, objects, or events between which a relation exists.

  • 2Linguistics. Viggo Brøndal's term for: the concept of substance, one of four concepts (along with descriptum, relator, and descriptor) which, in various combinations, form the logical basis of all parts of speech (now rare). Also (in later use): a word or phrase referring to a secondary or background entity to which the focal part of the sentence is related.

Origin

Mid 17th century; earliest use found in Michael Hudson (1605–1648), Church of England clergyman and royalist agent. From post-classical Latin relatum.