They've also added the word adorkable after it was voted in by Twitter users and have described the meaning of the word as "socially inept or unfashionable in a charming or endearing way".
The new edition of the dictionary contains 722,000 words and is the largest single volume dictionary in print.
al desko - (a meal, esp lunch) at one's desk at one's place of work
Bitcoin - a system of open source peer-to-peer software for the creation and exchange of (payment in) a certain type of cryptocurrency.
meme - an idea or element of social behaviour passed on through generations in a culture, esp by imitation
Photobomb, selfie and onesie are just some of the words that have been added to the new print edition of the Collins English dictionary.