This is the 569th most frequent Polish word.
miesiąc
"Month."
In this sentence, 'miesiąc' refers to one of the twelve divisions of the calendar year, demonstrating its use to define units of time.
Każdy miesiąc w roku ma co najmniej 28 dni.
Each month of the year has at least 28 days.
In this instance, 'miesiąc' is used to identify February as a specific unit of the calendar year.
Luty to miesiąc, w którym obchodzimy walentynki.
February is the month in which we celebrate Valentine's Day.
Here, 'miesiąc' is employed to represent a time span, and this sentence emphasizes its plural form 'miesiąca' when combined with a quantity.