Keeping it Up-to-date

There is no living language that does not change or produce new words. In order to cope with the ongoing changes, it is important to update dictionaries regularly.
Therefore, William Craigie and Charles Onions started developing a supplement to the ten volumes shortly after the dictionary had been published. It was published as a single volume in 1933. In the meanwhile, the Dictionary itself was being updated and reprinted in twelve volumes. It was published under the current title ‘Oxford English Dictionary’.
In 1957, Robert Burchfield became responsible for the development of a new Supplement. It should replace the old one from 1933 and include more scientific and technical terms. It was published between 1972 and 1986 in four volumes.
(OED Homepage)