Definition of auto- in English:

auto-

Pronunciation: /ˈɔːtəʊ/
(usually aut- before a vowel)

combining form

1.1One’s own: autograph
1.3By itself or automatic: autofocusing

Origin

from Greek autos 'self'.

Definition of auto- in:

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Word of the day noisome
Pronunciation: ˈnoisəm
adjective
having an extremely offensive smell