Definition of omni- in English:

omni-

combining form

1All; of all things: omniscient omnifarious
1.1In all ways or places: omnicompetent omnipresent

Origin

from Latin omnis 'all'.

Definition of omni- in:

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Word of the day envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous