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



 combining form
combining form
BrE BrE//ˈeksə//
; NAmE NAmE//ˈeksə//
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(in units of measurement) 1018 exajoule Word Originfrom (h)exa- from Greek hex ‘six’, based on the supposed analogy of tera- and tetra-.
See the Oxford Advanced American Dictionary entry: exa-