The position of principal speaker was the closest role to that of leader within the Green Party until 2008.

Roger Mudd, the television news correspondent, was the principal speaker.

He said: "Patty was the principal speaker at one of the sessions.

You can get past your first appearance as a principal speaker by using an audience-participation quiz.

Well now I have the principal speaker for the day.

There were three principal speakers in the discussion.

Tonight, for the second night in a row, one of the principal speakers at the Republican National Convention was a black person.

A political rally adjourned early because the principal speaker failed to show up.

They are the principal speakers of the Kwavi language.

The principal speaker, Mr. Green, is clearly one of this town's favorite people.