This is the 680th most frequent Polish word.
trzy
"Trzy" means "three" in English.
The word 'trzy' is used as a cardinal numeral indicating the quantity three.
Mam trzy książki na półce.
I have three books on the shelf.
The word 'trzy' identifies the number of segments into which the cake should be divided, used here as a numeral.
Podziel ciasto na trzy równe części.
Divide the cake into three equal parts.
Here, 'trzy' specifies the exact time of the meeting, used as a cardinal number for time identification.