American Heritage Dictionary
(2)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
When the noun to which they are suffixed has a double form, the postposition is added to the short form Ex.— The Mafulu Mountain People of British New Guinea
The terminal, co_, is the postposition, at.— Rig Veda Americanus Sacred Songs of the Ancient Mexicans, With a Gloss in Nahuatl
The accusative case in nouns is marked by a postposition, _ku_, as in— The Seven Great Monarchies Of The Ancient Eastern World, Vol 1. (of 7): Chaldaea The History, Geography, And Antiquities Of Chaldaea, Assyria, Babylon, Media, Persia, Parthia, And Sassanian or New Persian Empire; With Maps and Illustrations.
The terminal, _co_, is the postposition, at.— Rig Veda Americanus Sacred Songs of the Ancient Mexicans, With a Gloss in Nahuatl

Century Dictionary (1)
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