Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: erratique, from Latin errare; ERR

erratic

 adjective
     
er‧rat‧ic
something that is erratic does not follow any pattern or plan but happens in a way that is not regular:
His breathing was becoming erratic.
his erratic behaviour
—erratically adverb:
He always drives erratically.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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