in part; to some extent or degree; partially; not wholly: His statement is partly true.

1515–25; part + -ly

partially, partly. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
partly (ˈpɑːtlɪ)
to some extent; not completely
usage  Partly and partially are to some extent interchangeable, but partly should be used when referring to a part or parts of something: the building is partly (not partially) of stone, while partially is preferred for the meaning to some extent: his mother is partially (not partly) sighted

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Gray-green leaves tend to drop off around bloom time, but this partly deciduous
  tree does not lose all of its foliage.
In summer can be moved outdoors to a partly shaded patio.
Needless to say, many fabled stories of her life are partly fiction.
If laypeople don't appreciate it, that's partly because unsolved problems still
  loom large.
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