PT - JOURNAL ARTICLE AU - NejedlĂ˝, Petr TI - Development of the verbal prefix po- in the Old and Middle Czech DP - 2013 Dec 1 TA - Bohemica Olomucensia PG - 277--284 VI - 5 IP - 4 AID - 10.5507/bo.2013.029 IS - 1803876X 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'.