irregular

definition: 
Occurring at uneven or varying rates or intervals
sentence: 
Income can be withdrawn at irregular intervals to suit individual circumstances as long as the payments are in accordance with the above limits.
The rhythm is irregular, and the rate can vary or become sinus bradycardia because of the long pauses.
difficulty: 
very easy
toefl frequency: 
2
toefl classification: 
adverb: 
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