PT Journal AU Nejedly, P TI Development of the verbal prefix po- in the Old and Middle Czech SO Bohemica Olomucensia PY 2013 BP 277 EP 284 VL 5 IS 4 DI 10.5507/bo.2013.029 AB The number of verbs with the prefix po- increases in historical Czech depending on the expanding lexis. Functions of the prefix are changing, e. g. the meaning of a small intensity of a process or its distribution is more frequent in Middle Czech; it is diminishing in the meaning 'the beginning of a process'. ER