This is the 4926th most frequent Russian word.
командировке
Business trip.
This usage illustrates 'командировке' as a locational noun in the prepositional case denoting 'on a business trip'.
Я был в командировке в Москве.
I was on a business trip in Moscow.
Here, 'командировка' is in the accusative case, indicating motion 'to a business trip'.
Он уехал в командировку вчера.
He went on a business trip yesterday.
In this instance, 'командировке' depicts the prepositionally-cased temporal context of 'during a business trip'.