The status of being unregulated or uninhibited by normative social, political, and/or geographic factors. Similar to but not synonymous with the term 'freelance'.
'Carol is a designer-at-large. She has been in six different cities in the last two years marketing her graphic design services to other small businesses.'
Secretary of State: presently Hillary Clinton. This person directly represents the President, especially in foriegn policy matters; also, third successor to the Presidency behind the Vice-President, and the Speaker of the House.
President-at-large, Secretary Hillary Clintion, is constantly on the move around the world addressing issues for the President.
When some resigns or retires from a job, they are on "eternity leave". This can also refer to someone who has passed away, especially someone who worked somewhere for a long time, retired/resigned, then passed away later.
Oh I'm sorry, you didn't know that Kelly is on eternity leave? She resigned and moved to Hawaii!
With regrets I would like to inform you that my boss is officially on eternity leave. I will never see or hear them again. Ever.