That which is named or designated by a linguistic term.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "designatum" in a sentence
"The designatum must first be picked out in α by whether it meets the descriptive requirements (with or without the indexing) there in α: but the purpose of the indexing is to keep the term referring, with respect to other worlds, to that same item picked out originally in α by virtue of meeting the right requirements there."
"Here are some considerations in favor of saying that an expression could be rigid de jure without directly referring to its designatum."
"Here you use the description to fix the reference, not as a synonym: whatever individual is most filled with joy is the designatum, even when we are discussing worlds in which that same individual is glum."