The new word - a mix of adorable and dork - is slang for someone who is "socially inept or unfashionable in a charming or endearing way".
It was chosen from a shortlist of nine of the most popular words from social media sites, which was released into the Twittersphere for the "tweeple" to decide.
It received nearly a third of the votes, beating rivals such as felfie (a farmer selfie), gaybourhood (a gay friendly area) and fatberg (a large ball of sewer lard) to a place into the 12th edition of the Collins English Dictionary.
Lucy Mangan, Collins blogger, said: "Into the dictionary it goes, allowing Collins to close the gap between the recording of a living language and its movements in the real world more than ever before.
"At last the internet starts giving something back to word nerds."
By Catherine Richardson
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