From Longman Dictionary of Contemporary Englishbigwigbig‧wig /ˈbɪɡwɪɡ/ noun [countable] informalIMPORTANT an important person A few of the company bigwigs have their own jets.
Examples from the Corpus
bigwig• The employee is hauled before a series of bigwigs.• Democrats are not alone in soliciting big-money donations or coupling them with access to political bigwigs.• They have links with political bigwigs and the local administration, which is all the qualification needed to get into the business.• I would throw myself on the mercy of the circuit-house, usually reserved for traveling politicians and sundry bigwigs.• Some of them were bigwigs in the administration of the islands. 