Webster's English Dictionary

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periodical

1. pe.ri.od.i.cal \.pir-e--'a:d-i-k*l\ \-k(*-)le-\ aj 1: PERIODIC  2a: 
   published with a fixed interval between the issues or numbers  2b: 
   published in, characteristic of, or connected with a periodical  - 
   pe.ri.od.i.cal.ly av
2. periodical n : a periodical publication