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Definition of peta- combining form from the Oxford Advanced Learner's Dictionary

 

peta-

 combining form
combining form
BrE BrE//ˈpetə//
 
; NAmE NAmE//ˈpetə//
 
 
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(in nouns; used in units of measurement) 1015; one thousand million million Word Originfrom pe(n)ta-, from Greek pente ‘five’ (see penta-); based on the supposed analogy of tera- and tetra-.

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