You need transit visa only if you want to go out from the airport to the city. If you stay in airport, you will be in a transit zone without passing the boarder. In this case you no need to have transit visa.
However, for 14 hours you may see a lot of interesting things in a city. More information about visas you may find there: http://www.abudhabiairport.ae/english/airport-information/check-in-and-passport-control/immigration-and-visas.aspx
If you are a citizen of one of the following countries, you will be
issued with a free-of-charge visit visa upon entry: UK, France, Italy,
Germany, the Netherlands, Belgium, Luxembourg, Switzerland, Austria,
Sweden, Norway, Denmark, Portugal, Ireland, Greece, Finland, Spain,
Monaco, Vatican, Iceland, Andorra, San Marino, Liechtenstein, Poland,
Slovenia, Slovakia, Czech Republic, Lithuania, Hungary, Latvia,
Estonia, Malta, Cyprus, Croatia, Romania, Bulgaria, United States,
Australia, New Zealand, Japan, Brunei, Singapore, Malaysia and Hong
Kong.