Definition of mega- in English:

mega-

Pronunciation: /ˈmɛɡə/

combining form

2(In units of measurement) denoting a factor of one million (106): megahertz
3 Computing Denoting a factor of 220.

Origin

from Greek megas 'great'.

Definition of mega- in:

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Word of the day bimble
Pronunciation: ˈbɪmb(ə)l
verb
walk or travel at a leisurely pace