This is the 191st most frequent Macedonian word.
нивната
"Their" (possessive pronoun).
In this sentence, 'нивната' is used as a possessive pronoun (their) modifying the feminine noun 'куќа'.
Нивната куќа беше многу убава.
Their house was very beautiful.
Here, 'нивните' is the plural possessive pronoun, indicating ownership, connected to the plural noun 'идеи'.
Тој ги сака нивните идеи.
He likes their ideas.
In this case, 'нивната' refers to possession relating to the feminine singular noun 'школа' (school).