blockblock1 /blɒkblɑːk/ noun [countableC]1FINANCE a large number of shares in a particular company held by one owner or traded at one time. A block of shares usually involves 10,000 shares or moreThe company paid C$17.5 million to acquire a block of 1,224,489 shares.
A 10 million-share block trade in Avon at 39½ excited traders early in the day.
Wall Street’s best-known and most aggressive block trader
2PROPERTY a large building divided into separate partsa block of apartments
office blocks