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Why are Proto-Germanic *fraiwą and Old Norse frjó / fræ (oblique stems frjóvi / frævi) cognate? I don't understand why are PGmc ai and Old Norse / æ cognate?

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The part of the table "History of Old Norse and Old Icelandic vowels" from here

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  • next to a possibly regular development (try Fulk's grammar) consider possible conflation with *fri(j)on- "to love", frja, *fri(j)ond- "friend", frændi (cp. Ger. f. Freundin "girlfriend"), unclear *frija- "free", no ON, deemed secondary "... from 'related', a shift that points to a clan-based societal system." (Kroonen 2013); further perhaps *froi- "early", no ON (AGr. proios; cp. eg. Jungfrau "virgin; young-woman" for semantics, Frühling "spring"; breakfast ~ G Frühstück vs to break-in ~ G einweihen?); *frawa- "quick, light", extended meaning "joy"; *fraujan- "lord"…
    – vectory
    Aug 25 '20 at 11:01
  • I hadn't recognized *fraiwa "seed", assuming "wife" instead, viz Ger. Frau. Oops! It's still relevant because Kroonen (2013: *fraiwa-) in face of an uncertain etymology rejects 'praegnans', 'parere' or *sper- "to sow", and compares Freyr "fertility deity" < *frauja-, what's elsewhere from *fraujan- "lord" [en.WP], like Frau. But K'13 follows ON frjar, frjor, fraer, Icel. frjor adj. "fertile, prolific" < *fraiwa- with maybe metathesis from *frawja-, further implying ON frygð "blossoming, excellence", pace en.wt: "joy; lust" maybe MLG vröchde (cp. fruit < … < *bhruHg-?).
    – vectory
    Aug 25 '20 at 12:19
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The development of Proto-Germanic ai in the North Germanic languages is very complex. It depends on a number of factors (stressed/unstressed, followed by w, r/R, h etc.) - see e.g. Sandøy 2017

PGmc. ai > Proto-Norse æi (Fulk 2018: 70), which further developed into:

  • ǣ (before w) (Heusler 1921: 28);
  • ā (before r, h) (this ā further developed into ē in the i-umlaut environment);
  • ei (in OWN) or ē (OEN) (Versloot 2017: 285);

In your post, you ask about frǽ (and its variant frjó; Zoega 1926 says that fræ was "sometimes in old MSS. spelt freo or frjó (q.v.), but less rightly").

As you can easily notice, we have w after the diphthong in PGmc, which means PGmc ai developed into æ in Old Norse (see above), cf. Fulk 2018: 70

"In addition, Proto-Norse æi developed to ON æ (i.e., /æː/) before w (which might be lost, §6.14), as in *aiwīn- > OIcel. ævi ‘age’ (cf. Go. aíws < *aiwaz) and hræ ‘corpse’ (cf. Go. hraíw)."

Note: the acute and the macron are used interchangeably here, to indicate length.

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  • Is there a difference between the acute and the macron? I'm used to acutes indicating length in transcribed Old Norse, but it seems like there's a distinction here.
    – Draconis
    Aug 25 '20 at 22:38
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    @Draconis hmm, I meant for the acute to show length, nothing else. Trying to fix it now :)
    – Alex B.
    Aug 25 '20 at 22:40

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