RT Journal Article SR Electronic A1 NejedlĂ˝, Petr T1 Development of the verbal prefix po- in the Old and Middle Czech JF Bohemica Olomucensia YR 2013 VO 5 IS 4 SP 277 OP 284 DO 10.5507/bo.2013.029 UL https://bohemica.upol.cz/artkey/boh-201304-0001.php 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'.