In journalism, the abbreviation "CQ" is used to indicate that a fact, such as the spelling of a name, has been checked and found to be correct.
Cadit is the third person singular indicative active of the irregular Latin verb cado and quaestio is the nominative singular form of a third declension noun. These two words, together, form a sentence complete unto itself.
This is also used in informal logic as a fallacy where there is a 'poorly posed question'. As noted above, if the question posed has already been answered previously and a conclusion reached it is not necessary to engage with said question once more.