But predictions made by the individual participants in the Fed's monetary policy meeting indicated most expect the federal funds rate to rise above 0.5 percent by year-end.
The Federal Open Market Committee trimmed its economic growth forecast for 2015 to just 1.8-2.0 percent, down from March's 2.3-2.7 percent outlook, to account for the unexpected contraction in the first quarter of the year.
But the FOMC suggested it expected the economy to continue to strengthen slowly, with growth picking up to a 2.4-2.7 percent pace next year and the unemployment rate -- a key referent for monetary policy -- slipping from the current 5.5 percent to as low as 5.2 percent at the end of this year and 4.9 percent in 2016.
It said that while the jobless rate has not moved much, job creation has picked up and that, and other indicators, suggest falling slack in the employment market.
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As for the other key base for policy, inflation, the FOMC said that the very low level of price gains is related to the crash in oil and import prices, both "transitory" effects that should disappear, allowing prices to rise toward its target rate of about 2.0 percent.
The hold on the first rate increase in nine years -- with the rate at zero for more than six years -- was expected after the first-quarter stall. A year ago, the FOMC had pointed to a first rate rise in mid-2015.
But Fed Chair Janet Yellen said there were still signs of cyclical weakness in the economy, especially in the labor market.
Wage growth is slow, and the labor force participation rate remains low, she noted in a news conference. "Room for further improvement remains."
"My colleagues and I would like to see more decisive evidence that a moderate pace of economic growth will be sustained, so the conditions in the labor market will continue to improve and inflation will move back to 2 percent," she said.