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Definition of PD day noun from the Oxford Advanced Learner's Dictionary

PD day

noun
 
/ˌpiː ˈdiː deɪ/
 
/ˌpiː ˈdiː deɪ/
(especially Canadian English)
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  1. professional development day (a day on which classes at schools are cancelled so that teachers can get further training)
See PD day in the Oxford Advanced American Dictionary

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