This is the 3128th most frequent Dutch word.
dubbele
"Dubbele" means "double" in English.
Here, 'dubbele' modifies 'espresso' to describe the quantity as doubled (a double serving).
Ik heb een dubbele espresso besteld.
I ordered a double espresso.
In this sentence, 'dubbele' qualifies 'lens', explaining that the lens has a double characteristic.
Ze zag alles door een dubbele lens vanwege haar bril.
She saw everything through a double lens because of her glasses.
The word 'dubbele' here refers to appointments being set twice, indicating redundancy.