This is the 1680th most frequent Swedish word.
martinus
The Swedish word "martinus" does not have a specific meaning in standard Swedish; it may be a proper noun, such as a name.
The word 'Martinus' is used here as a proper noun, referring to a name of a person, who is the subject of the sentence.
Martinus studerar varje dag.
Martinus studies every day.
In this sentence, 'Martinus' serves as a proper noun and is the focal subject of discussion within a prepositional phrase, modifying 'book'.
Boken om Martinus var mycket inspirerande.
The book about Martinus was very inspiring.
Here, 'Martinus' acts as a proper noun that is the subject of the action described in the sentence; it denotes the person performing the action.