This is the 14744th most frequent Russian word.
письменности
"Письменности" means "written language" or "writing system" in English.
Here 'письменности' is used to describe the evolution and progress of writing systems.
Развитие письменности сыграло важную роль в развитии цивилизации.
The development of writing played an important role in the development of civilization.
In this case, 'письменностей' denotes the plural form, referring to different writing systems.
Изучение различных письменностей мира помогает понять культурное разнообразие.
The study of various writing systems of the world helps understand cultural diversity.
The word 'письменности' refers to the concept of 'writing' as a systematic method used to record language.