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-.

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Word of the day semblance
Pronunciation: ˈsɛmbləns
noun
the outward appearance or apparent form of something…