Definition of alt- in English:

alt-

Pronunciation: /ɔːlt, alt/
(also alt.)

combining form

Denoting a version of something, especially popular 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 Internet newsgroups.

Definition of alt- in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up