This is the 2301st most frequent Portuguese word.
dumont
"Dumont" is not a common word in Portuguese; it is primarily a surname, notably associated with aviation pioneer Alberto Santos-Dumont.
In this sentence, "Dumont" is part of a proper noun, representing the last name of Alberto Santos Dumont, a historical figure.
Alberto Santos Dumont foi um pioneiro da aviação.
Alberto Santos Dumont was an aviation pioneer.
Here, "Dumont" refers to Alberto Santos Dumont in a condensed form, generally applicable to known figures.
Eu comprei um livro sobre a vida de Dumont.
I bought a book about Dumont's life.
"Santos Dumont" in this context refers to the name of a city in Brazil, named after Alberto Santos Dumont.