Why partitive? Possible motivations for the partitive complement of Finnic adpositions

Adpositions localize an entity (Figure) with respect to another entity (Ground), designated by the complement of the adposition. Most Finnic adpositions are postpositions with a genitive Ground, while prepositions typically have a partitive Ground. This work is a cognitive-linguistic study of the synchronic and diachronic semantics of partitive-Ground adpositions. It is argued that adpositions with a partitive Ground select a proximal perspective to the locational relationship, while those with a genitive Ground select a distal perspective. Three alternative hypotheses are introduced and compared concerning the origin of two Finnish partitive-Ground adpositions, kohti ‘towards’ and päin ‘towards’: 1) These adpositions originated as instructive-case body-part expressions of position (cf. selin ‘with one’s back at’), and their partitive Ground
indicated a viewpoint person; 2) They were instructive forms with a meronymic-locative meaning, expressing a more precise target area within the Ground, together with a directionality toward that area; 3) The Ground of kohti and päin was originally a partitive object of ‘aiming’ or ‘shooting’ verbs, and the soon-to-be adpositions themselves were lexicalized adverbs of direction.