Definition of mega- in English:

mega-

Pronunciation: /ˈmɛɡə/

combining form

1Large: megalith
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 neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal