Historically the principal function of the chief was to lead his clan in battle on land and sea.

Its principal function would be to monitor the security of agents' traffic.

Their principal function is to ask questions that allow the other characters to reveal themselves.

They set up a consulting firm, whose principal function was to advise their original companies.

The principal function of the Parliament is to pass laws, or legislation.

The principal function was the storage of wine and its preparation for serving.

Its principal function is to show motion away from a point in space or time.

The act sets out the principal functions of the Commission.

Although its principal function is as a financial quarter, there are a number of restaurants and hotels.

The principal functions of the commissioners' court are legislative and executive.