LONDON — Britain’s media are in a meltdown and its government is gaffe-prone, so Oxford Dictionaries has chosen an apt Word of the Year: “omnishambles.”

Oxford University Press crowned the word — defined as “a situation that has been comprehensively mismanaged, characterized by a string of blunders and miscalculations” — its top term of 2012.

Each year Oxford tracks how the English language is changing and chooses a word that best reflects the mood of the year. The publisher typically chooses separate British and American winners. This year’s American champion is “gif,” short for graphics interchange format, a common format for images on the Internet. The editors said gif was being recognized for making the crucial transition from noun to verb, “to gif”: to create a gif file of an image or video sequence, especially relating to an event. And, inevitably, to share it online. Cute kittens, Olympic champions, they’ve all been giffed.

Coined by writers of the satirical television show “The Thick of It,” omnishambles has been applied to everything from government PR blunders to the crisis-ridden preparations for the London Olympics.

Oxford lexicographer Susie Dent said the word was chosen for its popularity as well as its “linguistic productivity.” Omnishambles was chosen over shortlisted terms including “mummy porn” — the genre exemplified by the best-selling “50 Shades” book series — and “green-on-blue,” military attacks by forces regarded as neutral.