Associative case

The associative case (abbreviated ) is a grammatical case which expresses associativity which is, although related, not identical to comitativity, which is expressed by using the comitative case.
Associativity is a grammatical category which expresses the meaning "X and the group (of one or more members) associated with X", where X is a nominal, typically of human reference. An example is the Hungarian meaning "John and associates / John and his group / John and them", or the Japanese meaning "Tanaka and associates / Tanaka and his group / Tanaka and them".
Associations in English can be identified by words such as with, or along with.[3] Another name for this is Instrumental Case.[4] Instrumental Case, in the past--has been identified as 'means by which', in that it expresses the notion of means by which an action was done.[5]
References.
[3] "Associative Case.", http://ccat.sas.upenn.edu/plc/tamilweb/book/chapter2/node23.html.
[4] "Associative/Instrumental Case.", http://ccat.sas.upenn.edu/plc/tamilweb/book/chapter2/node22.html.
[5] "Instrumental Case: Means by Which.", http://ccat.sas.upenn.edu/plc/tamilweb/book/chapter2/node24.html#SECTION00135200000000000000.