Definition of exa- in English:

exa-

Syllabification: exa-

combining form

(Used in units of measurement) denoting a factor of 1018: exajoule

Origin

from (h)exa- (see hexa-), based on the supposed analogy of tera- and tetra-.

Definition of exa- in:

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Word of the day flippant
Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude