‘Retweet’ is amongst the latest 400 words to be added to the newest Concise Oxford English Dictionary.

"These additions are just carrying on the tradition of a dictionary that has always sought to be progressive," said OED editor Angus Stevenson.

Other notable modern and technology-related words being added to the next edition include:

Cyberbullying
Sexting
Textspeak
Woot

The dictionary entries are as follows:

Retweet
Pronunciation:/riːˈtwiːt/
verb
(on the social networking service Twitter) repost or forward (a message posted by another user)
Noun
a reposted or forwarded message on Twitter

Cyberbullying
Pronunciation:/ˈsʌɪbəˌbʊliɪŋ/
noun
the use of electronic communication to bully a person, typically by sending messages of an intimidating or threatening nature

Sexting
Pronunciation:/ˈsɛkstɪŋ/
noun
the sending of sexually explicit photographs or messages via mobile phone

Textspeak
Pronunciation:/ˈteks(t)ˌspēk, /
noun
Language regarded as characteristic of text messages, consisting of abbreviations, acronyms, initials, emoticons, etc.

Woot
Pronunciation:/wuːt/
exclamation
used to express elation, enthusiasm, or triumph