This is the 213th most frequent Serbian word.
културног
Of "cultural."
Here, the word "културног" functions as an adjective in the genitive singular form, describing the type of enrichment ("cultural enrichment").
Посетили смо музеј ради културног уздизања.
We visited the museum for cultural enrichment.
In this sentence, "културног" is used as an adjective in the genitive singular form to describe the heritage ("cultural heritage").
Студенти су припремили презентацију о културног наслеђу Србије.
The students prepared a presentation on Serbia's cultural heritage.
The word "културног" is an adjective in the genitive singular form, qualifying "значаја" ("significance") and specifying that the significance is "cultural".