The prepositions ἀνά and κατά with the accusative signal distributivity (per, by, for each).
The distributivity of ordinal numbers is usually expressed by ἀνά or κατά: καθ' ἔνα 'one by one', ἀνὰ δύο 'by two', κατὰ πέντε 'by five'.
The distributive meaning is the only meaning ἀνά retains in Koine.
In contrast to Latin, Greek has no distributive numbers like singulī 'one each', bīnī 'two each' or trīnī 'three each'. The compounds of ordinals with συν- have the same meaning, but are very rare.