This is the 206th most frequent Danish word.
gamle
"Gamle" means "old" in English.
Here, "gamle" is an adjective describing the noun "mand" (man), indicating his old age.
Den gamle mand går langsomt.
The old man walks slowly.
In this sentence, "gamle" is also an adjective, but it modifies "skole" (school) to specify that it is the school we used to attend.
Vi besøgte vores gamle skole i går.
We visited our old school yesterday.
Here, "gamle" modifies the plural noun "traditioner" (traditions), indicating their historical or long-standing nature.