This is the 7696th most frequent Polish word.
lutego
"Lutego" means "February" in Polish when used in the genitive case.
Here, 'lutym' is the locative case of 'luty' used after the preposition 'w' to indicate 'in February'.
Wyjeżdżam na ferie zimowe w lutym.
I'm going on winter vacation in February.
In this sentence, 'lutego' is the genitive case of 'luty' used with the numeral to specify the date.
Urodziłem się 14 lutego.
I was born on February 14th.
Here, 'lutego' is again in the genitive case, used to indicate possession or association ('the end of February').