Published or released before a person's death, or more rarely, referring to something created in anticipation before the author's death.
From Latin 'ante' (before) combined with 'posthumous' (occurring after death), creating an antonym describing pre-mortem publication.
This is practically a ghost word—it's theoretically logical but almost never used because when something comes out before someone dies, we just say 'published during their lifetime,' but scholars still create these perfectly reasonable words that nobody ever actually needs.
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