Definition of per se adverb from the Oxford Advanced American Dictionary

 

per se

 adverb
adverb
NAmE//pər ˈseɪ//
 
(from Latin)
 
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used meaning “by itself” to show that you are referring to something on its own, rather than in connection with other things The drug is not harmful per se, but is dangerous when taken with alcohol.
See the Oxford Advanced Learner's Dictionary entry: per se