No. 4,614 in Polish
miesiącem
"Miesiącem" means "month" in English (instrumental case of "miesiąc").
In a sentence
Styczeń jest pierwszym miesiącem roku.
January is the first month of the year.
Here, 'miesiącem' is used as an instrumental singular noun to denote 'being a specific month.'
Luty jest krótszym miesiącem niż marzec.
February is a shorter month than March.
'Miesiącem' is used in the instrumental case to attribute a property (being short) to February.
To był najzimniejszy miesiącem tej zimy.
It was the coldest month of this winter.
In this clause, 'miesiącem' appears as an error; the correct form should be 'miesiącem' here matching the instrumental case for 'najzimniejszym.'
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