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periodic
periodic acid
periodic function
periodic law
periodic motion
periodic sentence
periodic system
periodic table
periodical
periodical cicada
periodicity
periodization
periodontal
periodontics
perionychium
periosteum
periostitis
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periodical

pe·ri·od·i·cal [ pree óddik'l ]


noun  (plural pe·ri·od·i·cals)
Definition:
 
magazine: a magazine or journal published at regular intervals, especially weekly, monthly, or quarterly



adjective 
Definition:
 
1. published regularly: published at regular intervals

2. occasional: recurring or reappearing from time to time

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