periodical

definition: 
A magazine or newspaper published at regular intervals; Occurring or appearing at intervals; occasional:
sentence: 
He has a diploma in journalism and has published several features, stories and poetry in magazines and periodicals
At periodical intervals, the network returns the data to a central control room by cellular phone, satellite, or a conventional telephone circuit.
difficulty: 
very easy
toefl frequency: 
3
toefl classification: 
adverb: 
periodically
adjective: 
adverb sentence: 
I will periodically check on your progress
adjective sentence: 
verb: 
verb sentence: 
noun: 
noun sentence: