This is the 720th most frequent Ukrainian word.
великих
The Ukrainian word "великих" means "great" or "large" (genitive or plural form).
Here, 'великих' is used as an adjective in the genitive plural to describe 'cities', highlighting their size (large).
Навколо великих міст часто утворюються промислові зони.
Around large cities, industrial areas often form.
In this sentence, 'великих' is again an adjective in the genitive plural, describing 'dimensions' (size), indicating that the dimensions of the house are large.
Вони придбали будинок великих розмірів.
They bought a house of large size.
Here, 'великих' functions as an adjective in the genitive plural, modifying 'writers', which means 'great' in terms of their significance or impact.