The source basis for the article is the deed of transfer of the Ostróg castle in Volhynia from 1542, entered into the Crown Register No. 65. This handwritten document contains interesting vocabulary related to the material and socioeconomic culture of the area. The article discusses the part of the lexicon used to name feudal dues, payments and levies. Apart from the terms commonly used in Poland at the time, also some rare words and regional forms characteristic of Lithuanian and Russian lands that had not been documented for the 16th century in earlier lexicographic studies on the subject are presented.