In linguistics, the ablative case is a noun case found in several languages, including Latin, Sanskrit and in the Finno_Ugric languages.
The Latin ablative combines the functions of the Indo_European ablative (indicating "from"), instrumental (indicating "with" or "by"), and locative (indicating "in") cases. From these original meanings several others developed, including the ablative of cause (indicating "caused by"), the ablative of time (indicating "at the time of", deriving from the locative), and the ablative absolute.
In Finnish, the ablative case is the sixth of the locative cases with the meaning "from off of", e.g. pöytä — pöydältä "table — off from the table". It is an outer locative case, used just as he adessive and allative cases to denote both being on top of something and "being around the place" (as opposed to the inner locative case, the elative, which means "from out of" or "from the inside of").
The Latinablative combines the functions of the Indo-European ablative (indicating "from"), instrumental (indicating "with" or "by"), and locative (indicating "in") cases, which merged together in the development of Latin.
From these original meanings several others developed, including the ablative of cause (indicating "caused by"), the ablative of time and means (indicating "at the time of", deriving from the locative), and the ablative absolute.
In Finnish, the ablative case is the sixth of the locative cases with the meaning "from off of", e.g.
Caesare duce: Similarly, this kind of ablative absolute may be analyzed as a temporal ablative (that is, a metaphorical extension of the locative case) or as an associative-instrumental ablative (for instance, in the sense of "with Caesar being the leader").
Degree of Difference: The Ablative of Degree of difference is a development of the ablative of means: the amount of the difference being considered the means by which something is different.
The Ablative of Respect seems to have had a composite origin or was influenced at least by two different case-functions: the locative function and the instrumental function.