This is the 11251st most frequent Russian word.
двойного
"Double" or "of double."
Here, 'двойного' is used as an adjective to describe coffee being of double the usual volume.
Я заказал кофе двойного объема.
I ordered coffee of double the volume.
In this sentence, 'двойного' is used to qualify 'errors,' indicating that they are of a double-sided nature.
Для успеха в эксперименте необходимо учитывать возможные двойного рода ошибки.
For success in the experiment, it is necessary to consider possible double-sided errors.
Here, 'двойного' modifies 'замка,' referring to the lock system having two layers of security.