[wurth-hwahyl, -wahyl]
such as to repay one's time, attention, interest, work, trouble, etc.: a worthwhile book.

1865–70; worth1 + while

worthwhileness, noun

valuable, rewarding, beneficial.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
worthwhile (ˌwɜːθˈwaɪl)
sufficiently important, rewarding, or valuable to justify time or effort spent

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
When you turn your technique into lightness, that's what is worthwhile.
We all draw the line somewhere as to which traditions are worthwhile and to
  what degree.
Apparently, the reachers envisioned themselves creating a worthwhile study but
  failed miserably.
There simply aren't enough jobs to make it worthwhile.
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