* "Big test" for the U.S. dollar looms as Fed meeting concludes
* Rate hike signal, balance sheet reduction could boost greenback
* Kiwi jumps to over 1-mth high on election poll
* Yen unmoved by Trump's fiery North Korea rhetoric at the U.N.
* Graphic: World FX rates in 2017 http://tmsnrt.rs/2egbfVh
LONDON, Sept 20 (Reuters) - The dollar edged closer to 2-1/2-year lows hit earlier this month on Wednesday, as investors waited to see whether ratesetters in the United States would signal tighter policy or hold off because of tepid inflation data.
The U.S. Federal Reserve concludes a two-day policy meeting on Wednesday, and investors are looking for clues on a potential December rate hike and on the reduction of a massive balance sheet run up through years of post-crisis money-printing.
But caught between a lull in U.S. inflation and a stronger global economy, the market is uncertain whether the Fed will signal its third interest rate hike of the year or back off until prices rise more briskly.
"Fed members have become less hawkish of late, and that has started to weigh on the dollar," said OANDA analyst Craig Erlam.
"We are likely to find out today if (the dollar) can go any lower or if it has bottomed out. It is a big test," he added.
The index that measures the greenback against a basket of major currencies was 0.1 percent lower in European trade and not far from a two-year low hit earlier this month.
The currency has fallen more than 11 percent this year so far, as expectations for pro-growth, pro-inflation policies from U.S. President Donald Trump -- the so called "Trumpflation trade" -- have receded, making the Fed's monetary policy path trickier.
Currency markets showed little reaction to Trump's speech to the U.N. General Assembly on Tuesday, in which he said the United States will be forced to "totally destroy" North Korea unless Pyongyang backs down from its nuclear challenge.
The kiwi dollar was the largest mover among major currencies on Wednesday, rising to a 1-1/2 month high after a poll showed New Zealand's ruling National Party has a wide lead over the opposition ahead of a general election at the weekend.
Support for New Zealand's National Party jumped 6 points to 46 percent, according to the One News-Colmar Brunton opinion poll, while support for the opposition Labour party slumped by seven points to 37 percent. Labour had surged in recent weeks.
The Kiwi dollar was up 0.7 percent at $0.7371 by 1108 GMT after its initial surge to $0.7375.
The Australian dollar was up around half a percent at $0.8047 after comments overnight from Australia's central bank outlined the constructive growth conditions for its economy.
The euro added 0.1 percent to $1.2007, at one stage reaching as high as $1.2022, close to its Sept. 8 high of $1.2092, its strongest since January 2015.
For Reuters Live Markets blog on European and UK stock markets see reuters://realtime/verb=Open/url=http://emea1.apps.cp.extranet.thomsonreuters.bi z / c m s / ? p a g e I d = l i v e m a r k e t s (Reporting by Abhinav Ramnarayan and Ritvik Carvalho; Editing by Hugh Lawson)