This is the 488th most frequent Lithuanian word.
sausio
"Sausio" means "January" in English.
'Sausio' is used here as a genitive case form of 'sausis', signifying 'of January' to indicate possession or relation to the month.
Sausio mėnuo yra pirmas metų mėnuo.
January is the first month of the year.
In this sentence, 'sausio' is again in the genitive case, showing relation to the noun 'mėnesį' (month).
Aš gimiau sausio mėnesį.
I was born in the month of January.
'Sausio' is used to indicate a time period, specifically at the beginning of January, aligning with the noun it modifies.