This is the 18263rd most frequent Russian word.
чёрная
"Чёрная" means "black" (feminine form).
Here, 'чёрная' is used as an adjective describing the noun 'кошка' (cat), specifying its color.
У меня есть чёрная кошка.
I have a black cat.
In this sentence, 'чёрное' is the neuter singular form of the adjective 'чёрный,' agreeing with the noun 'платье' (dress).
Её платье чёрное и элегантное.
Her dress is black and elegant.
Here, 'чёрная' is used as an adjective describing the feminine noun 'книга' (book), indicating its color.