The Oxford English Dictionary is the unrivalled reference to the meaning, history and pronunciation of the English language. It defines over half a million words, and its ten volumes took 50 years to compile.

These days, the OED's lexicographers publish quarterly updates to the online edition. In the March 2012 update, they updated a number of key words, including 'blood', 'gas', 'school' and 'time'. Did you know that 'time' is the most frequently used noun in English? You do now.

As well as the above, many new words were added to the dictionary. Well-known ones include 'cringe-inducing', 'business-speak' and 'LARPing'. The other new words were maybe a little more obscure, but how many of them can you identify? I've listed 20 of the new words added in March 2012, and have given four possible definitions for each – can you spot the correct one?

You'll find the answers at the foot of the page, but no peeking until you've guessed them all!

1. adelite

a) a fan of pop star Adele
b) a rare arsenic-containing mineral
c) a thing of wonder
d) a type of superglue

2. aphagia

a) acute embarrassment