A nonrecurring dividend paid to shareholders in addition to the regular dividend. It is brought about by special circumstances.
A temporary increase in a firm`s dividends beyond the normal level.
A dividend paid additionally to the normal dividend when profits of a company are particularly... <a target=_blank href='http://www.finance-glossary.com/terms/extra-dividend.htm?id=528&ginPtrCode=00000&PopupMode=false' title='Read full definition of extra dividend'>more</a>
Is a payment declared or paid by a corporation in addition to its ordinary dividend policy. It can reflect a distribution of profits which are considered extraordinary. 
[n] - a dividend paid in addition to the regular dividend
noun a dividend paid in addition to the regular dividend