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The double zero grade *ǵʰi-m- is preserved in the compounds with numerals.

(de Vaan, Etymological Dictionary of Latin 2013: hiems)

E.g. *dwi-ǵʰim-os “two years old”, literally “of two winters” (en.Wiktionary: https://en.wiktionary.org/wiki/Reconstruction:Proto-Indo-European/%C7%B5%CA%B0%C3%A9y%C5%8Dm)

Unbelebtes *h1ésu-∅ kann zwar durch gr. εὖ, nicht aber durch altheth. šu oder ved. śu fortgesetzt werden, d.h. das Adverb *h1sú-∅ stellt keine erstarrte Kasusform dar. Vielmehr wurde es von der Komposition her, wo die Doppelnullstufe eines nominalen Vorderglieds durchaus am Platz ist (s. *du(-s-) Fn. 18), verallgemeinert.

(Dunkel, Lexikon der indogermanischen Partikeln und Pronominalstämme, Bd. 1, p. 305)

In short, Dunkel says *h1sú-∅ was generalized as *h1ésu-∅ from the double zero grade of some (“eines”) noun prefix.

If I understand correctly, this means that *dwi is zero grade, *ǵʰi-m- is zero grade, so the compound is double that. The parallel in Dunkel's notation *-∅ makes that very clear.

I just don't understand the implication, because it is usually enough to point out the single zero grade and the evidence for it.

  • Double zero grade in numeral compounds may be ominous, as if the full grade might be derived from metanalysis of a consonant cluster as zero grade in one of those words, requiring an alternative etymology for it, but there is no indication of that.

    • De Vaan's bracketing *-m- is obvious, not to me though.
  • Dunkel's analysis doesn't profit from double zero grade. I don't have a full copy, but there is no obvious reason that the zero grade would occur first in double zero grade.

    • FYI, note that Wiktionary lists *h1su- as uncertain under *h1es- and offers an alternative explanation from *h1wes-.

Am I missing something? I am hesitantly not posting this as a reference request because I don't believe it is a thing. Convince me I am wrong.


Following @Janus' comment, *-m- is zero grade of the Genetive suffix, full-grade **-ém-, o-grade **-ōm-.

But still, this seems diametrical opposed to Dunkel saying that "*h1sú-∅ stellt keine erstarrte Kasusform dar", precisely not fossilized in case form.

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    De Vaan is saying that *g̑ʰi-m- is a double zero grade in itself, without even considering the form of the numeral: he takes the base form as being nom. *g̑ʰei̯-ōm (full-grade root, long o-grade suffix), acc. *g̑ʰi-ém-m̥ (zero-grade root, full-grade suffix), gen. *g̑ʰi-m-ós (zero-grade root, zero-grade suffix = double zero grade). The double zero grade found in the PIE genitive was lost in the inflectional paradigm of the base word in Latin, where the zero-grade/full-grade combination was generalised from the accusative, but it survived in compounds with numerals. Nov 26, 2023 at 20:12
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    As for the Dunkel quote, I’m not sure I quite follow his implications either, but as best I can tell, he’s assuming that *h₁su- is from a combination of *h₁es- + *-eu̯- (≈ a u-stem to *h₁es-), and then saying that the adverb *h₁su cannot be a frozen case form of this u-stem, because there are no forms in that paradigm that have double zero-grade (in both the root, *h₁s-, and the suffix, *-u-) and no overt case ending. Therefore, he says, the standalone adverb must be extracted from compounds with the stress on the head noun, where *h₁s-u-CV́- is just what we’d expect. Jan 24 at 16:31

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German seems to use different terms for Schwundstufe and Nullstufe, but English uses zero grade indiscriminately.

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