This is the 464th most frequent Azerbaijani word.
kütləvi
Mass or widespread.
Here, 'kütləvi' is used as an adjective describing 'informasiya vasitələri' (information tools), referring to 'mass' as it conveys usage on a broad scale.
Bu, kütləvi informasiya vasitələrində geniş yayılıb.
This has been widely spread in the mass media.
In this case, 'kütləvi' modifies 'iştirak' (participation), meaning 'massive' to denote the largeness or abundance in participation.
Festivalda kütləvi iştirak müşahidə olundu.
Massive participation was observed at the festival.
Here, 'kütləvi' directly relates to the noun 'hala' (state/phenomenon), signifying 'mass' or widespread nature as an intrinsic property.