This is the 186th most frequent Russian word.
очередь
Line, queue, or turn.
The word 'очередь' here refers to a line or queue in a place like a store.
Очередь в магазине была длинной.
The queue in the store was long.
In this sentence, 'очередь' implies one's turn in a sequence of actions.
Теперь твоя очередь отвечать.
Now it's your turn to answer.
Here, 'очередь' is used in the phrase 'в первую очередь', meaning 'first of all' to indicate priority.