This is the 3619th most frequent Russian word.
специальный
Special.
The word 'специальный' is used to indicate that the key is specially designed or modified for this particular door.
У меня есть специальный ключ для этой двери.
I have a special key for this door.
Here, 'специальный' highlights that the magazine issue is exceptional or distinct, containing unique content.
Специальный выпуск журнала содержит эксклюзивные материалы.
The special magazine issue contains exclusive materials.
The word 'специальный' denotes that the tool has been specifically crafted or tailored to fulfill the requirements of watch repair.