This is the 75th most frequent Lithuanian word.
šio
"Šio" means "of this" or "this" (genitive singular form in masculine).
In this sentence, 'šio' is the masculine singular genitive case of 'this', modifying the word 'house' to indicate possession.
Šio namo stogas yra raudonas.
This house's roof is red.
Here, 'šio' acts as a genitive masculine singular modifier, referring to 'this month's', in the context of time specificity.
Aš vis dar prisimenu praėjusio šio mėnesio renginius.
I still remember last month's events.
In this context, 'šio' ensures the item being referred to is specific, functioning as a demonstrative word in the genitive case.