This is the 386th most frequent Norwegian word.
allerede
Already.
In this context, 'allerede' emphasizes that the state of the store being closed has begun and is true even at this point in time.
Butikken er allerede stengt.
The store is already closed.
Here, 'allerede' is used to stress that the action of 'arriving' had occurred earlier than what might have been anticipated.
Han kom allerede for en time siden.
He arrived already an hour ago.
Here, 'allerede' is used as an adverb to indicate that the action described by the verb ('done') occurred prior to the present moment.