Plant says this definition, which first appeared in a 1930 ILO Convention Against Forced Labor, is still valid today.

VOA: standard.2009.08.21

White House Press Secretary Robert Gibbs said Wednesday no Iranians have responded to the invitations thus far, and that in any event they are no longer valid.

VOA: standard.2009.06.24

"Definitely being in a different country and learning about American culture, American education system and everything else geting a degree here will definitely be valid back in my country so I am very lucky to be here and my goal right after graduation I want to look for some sponsorship opportunities and also being able to stay in the United States to do some kind of work with some Tennis academy and travel a litle bit and play in some Tennis tournaments."

VOA: standard.2009.12.14