EN
The article presents the dictionary entry booster, which was additionally incorporated into the Academic Dictionary of Contemporary Czech. One of its meanings, ‘a dose of a vaccine that increases or renews the effect of an earlier one,’ has expanded in Czech rather widely in connection with the covid pandemic; however, four other meanings of this lexeme were identified on the basis of data from the Czech National Corpus. First the semantic structure of the entry is introduced, then I focus on how users of Czech orient themselves to the fact that the lexeme is a neologism.