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headquarters - noun

Definition

the center from which orders are given; the main offices of a business or organization

Example Sentences

Our headquarters are located in Poznań.
My boss flew back to headquarters for the quarterly meeting.

cooperate - verb 

Definition

to act or work together

Example Sentences

Let's cooperate and get this work done quickly.

She agreed to cooperate with the police to help catch the criminal.

neither - adjective

Definition

not one or the other of two

Example Sentences

Neither Tom nor his friend came to the party. I'm afraid I know neither Peter nor Shane.