A commissioner is, in principle, the title given to a member of a commission or to an individual who has been given a commission (official charge or authority to do something, the noun's second meaning). In practice, the title of commissioner has evolved to include a variety of senior officials, often sitting on a specific commission. In particular, commissioner frequently refers to senior police or government officials.
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Margrethe Vestager, EU's Competiton Commissioner, confirmed at Web Summit in Lisbon that the probe into Google AdSense would ...