Twitter is currently the most used word in the English language global print and digital media, according to the Global Language Monitor.
Over the course of 2009, the microblogging website term has become the word on everyone's lips.
Obama, H1N1, stimulus and vampire complete the top five words of the year list due in part to Barack Obama becoming the new president of the US, the emergence of swine flu, the economic downturn and Hollywood productions respectively.
Paul Payack, president of the Global Language Monitor, states: "In a year dominated by world-shaking political events, a pandemic, the after effects of a financial tsunami and the death of a revered pop icon, the word Twitter stands above all the other words."
The communication tool represents a new form of global social interaction via 140-character messages, he adds.
Meanwhile, Twitter and social networking portal Facebook both appear in Google's most searched for words of 2009 list.
A Google spokesperson said that Britons had "mixed feelings as they headed online this year" and predominantly searched for their preferred online tools, to learn about celebrities and to locate a bargain.
