Definition of alt- in English:

alt-

Syllabification: alt-
(also alt.)

combining form

Denoting a version of something, especially music, that is intended as a challenge to the traditional version: an alt-classical quartet

Origin

1990s: abbreviation of alternative, influenced by the alt. prefix of some Usenet newsgroups.

Definition of alt- in:

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Word of the day flagitious
Pronunciation: fləˈjiSHəs
adjective
(of a person or their actions) criminal; villainous