Definition of partly adverb from the Oxford Advanced Learner's Dictionary

  

partly

 adverb
adverb
BrE BrE//ˈpɑːtli//
 
; NAmE NAmE//ˈpɑːrtli//
 
 
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to some extent; not completely Some people are unwilling to attend the classes partly because of the cost involved. He was only partly responsible for the accident. Which Word?partly / partially Partly and partially both mean ‘not completely’:The road is partly/​partially finished. Partly is especially used to talk about the reason for something, often followed by because or due to:I didn’t enjoy the trip very much, partly because of the weather. Partially should be used when you are talking about physical conditions:His mother is partially blind.Extra examples Inflation accelerated partly as a result of increased oil prices. It is partly a matter of personalities, but only partly. It was partly my fault. Prosperity increased partly as a consequence of reduced inflation. The measure was popular, partly because it was a way of avoiding tax. The result is partly a matter of skill and partly of chance.
See the Oxford Advanced American Dictionary entry: partly