Something that is an ~ part of something is an essential part of that thing.
Rituals and festivals form an ~ part of every human society...
= basic, fundamental
ADJ: oft ADJ to n
Something that is an ~ part of something is an essential part of that thing.
Rituals and festivals form an ~ part of every human society...
= basic, fundamental
ADJ: oft ADJ to n
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012