This is the 6342nd most frequent Polish word.
bruce
The word "bruce" doesn't have a definition in Polish; it may be a proper noun or a mistaken term.
The usage of 'Bruce' here is to refer directly to a person's name who is being described as performing actions.
Bruce zataczał kręgi po boisku, pokazując swoją wytrzymałość.
Bruce circled around the field, demonstrating his stamina.
Here, 'Bruce' has been inflected in possessive form 'Bruce'a', indicating ownership of the lecture or speech.
Podczas odczytu Bruce'a wszyscy słuchali z uwagą jego słów.
During Bruce's lecture, everyone listened attentively to his words.
In this sentence, 'Bruce' is part of the proper name 'Bruce Springsteen', referring to the famous artist.