An adessive case (abbreviated ADE; from Latin adesse "to be present (at)": ad "at" + esse "to be") is a grammatical case generally denoting location at, upon, or adjacent to the referent of the noun; the term is used most frequently for Uralic studies.
For example, "mehel on auto" means "the man owns a car".
As the Uralic languages don't possess the verb "to have", the concept is expressed as a subject in the adessive case + on (for example, minulla on, "I have", literally "at me is").
The other locative cases in Finnish, Estonian, and Hungarian are: The Finnish adessive case has the word ending -lla or -llä (according to the rules of vowel harmony).
Other languages which employ an adessive case or case function include archaic varieties of Lithuanian (which likely developed by the influence of Uralic), some Northeast Caucasian languages such as Lezgian[2] and Hunzib,[3] and the Ossetic languages,[4] both ancient and modern.