Tweeting in the social-networking sense has become so pervasive that the Oxford English Dictionary has broken one of its own rules to add new meanings for "tweet" as both a noun and a verb.

"It seems to be catching on," wrote John Simpson, chief editor of the dictionary that bills itself as "the definitive record of the English language."

Traditionally, a new word needs to be in use for 10 years before the dictionary will consider it for inclusion, Simpson acknowledged in his online commentary for the dictionary's June 2013 update.

Nevertheless, both the noun that means "a posting made on the social networking service Twitter" and the verb that means "to post on Twitter" have just been added to the dictionary, Simpson wrote under the subhead "Quiet announcement."

The new entries appear below more traditional definitions of the word such as "a brief high-pitched sound or call made by a small bird" and "to communicate (something) with a brief high-pitched sound or call" in the dictionary, which was started more than 150 years ago.

The social networking service Twitter launched less than seven years ago, in July 2006.

"Tweet" was not included in the official full list of new word entries, sub-entries or new senses for June 2013. However, a large number of other terms pertaining to technology were, including live blog, mouseover, interoperability. Other new words this month include flash mob, fracking, headcuck, mochaccino and kombucha.