This is the 477th most frequent Greek word.
μόνος
Alone; only; solitary.
In this sentence, 'μόνος' is used as an adjective in its masculine singular form, indicating a state of being solitary or alone.
Είμαι μόνος τώρα.
I am alone now.
Here, 'μόνος' modifies the pronoun 'του,' meaning 'himself,' emphasizing the individualistic action taken without assistance.
Μόνος του κατάφερε να λύσει το πρόβλημα.
He managed to solve the problem by himself.
In this case, 'μόνο' is used as an adverb, signifying exclusivity, stating that Maria was the sole party attendee.