This is the 3539th most frequent Russian word.
россиянка
A female citizen of Russia.
The word "россиянка" is used here to refer to a woman from Russia, highlighting her nationality in a historical achievement.
Россиянка была первой женщиной-космонавтом.
The Russian woman was the first female astronaut.
In this sentence, "россиянка" denotes the nationality of a woman the speaker met, emphasizing her origins in the given context.
Я познакомился с россиянкой на конференции по экологии.
I met a Russian woman at the ecology conference.
Here, "россиянка" is used to describe a female participant in the chess championship, identifying her as being from Russia.