LATIN DICTIONARYLexicon Latīnum
adverb

aliquid

aliquid (not comparable)
Classical[ˈa.lɪ.kʷɪd]Ecclesiastical[ˈaː.li.kʷid]

Meaning

  1. not comparablesomewhat, to some extent

In the readers how our graded readers gloss it

something
aliquid — in Seneca, ch. XII

Charlton Lewis's shorter dictionary for students: the same scholarship in plain, modern definitions.

aliquid adv.,
somewhat, in something, in anything, at all, in some degree, to some extent: succensere: in me offendere: officere aliquid libertati vestrae, L.

Origins

Adverbial accusative of aliquis (“someone, something”).

Quick answers

What does aliquid mean in Latin?
aliquid, a adverb, means “somewhat, to some extent”.
How do you pronounce aliquid?
In classical Latin, [ˈa.lɪ.kʷɪd]; in ecclesiastical (church) Latin, [ˈaː.li.kʷid].