all-

From Middle English all- (also al-), from Old English eall-, eal- (“all-”). Cognate with Dutch al-, German all-, Swedish all-. More at all.

all-

1. Indicates complete power or authority in an area.

   Synonym: omni-

   ‎all- + ‎knowing → ‎all-knowing

   ‎all- + ‎loving → ‎all-loving

   ‎all- + ‎seeing → ‎all-seeing

   ‎all- + ‎powerful → ‎all-powerful

   ‎all- + ‎important → ‎all-important

2. Indicates that a term applies in a general manner.

   Synonyms: omni-, pan-

   ‎all- + ‎around → ‎all-around

   ‎all- + ‎over → ‎all-over

   ‎all- + ‎India → ‎all-India = union-level scope

   ‎all- + ‎Union → ‎all-Union = union-level scope

• Words derived from all- are usually formed with a hyphen.

• (all): omni-, pan-

• -wide

• LAL, Lal, Lal.

From all.

all-

1. located beneath, at the bottom, nether, sub-

all-

1. fairly, rather, decently [since the 17th century]
2. (dated) very

   Ekki allfáir viðskiptavinir.

   Very many customers.

• Hyphenating compound terms prefixed with all- is allowed (same with hálf-, jafn- and lang-):^[1]

  All-óhugnanlegur.

  Rather gruesome.

• (rather): sæmilega, heldur, nokkuð
• (very): mjög, einkar

• allfár (dated, synonym mjög fár; very few)
• allgóður (dated, synonym mjög góður; very good)
• allgóður (contemporary meaning, synonym sæmilegur; decent)
• allmikill (contemporary meaning; considerable)
• allvel (dated, synonym mjög vel; very well)
• allvel (contemporary meaning, synonym þolanlega, sæmilega; reasonably)
• enginn er allheimskur ef þegja má (no one is completely stupid if they can hold their silence; see silence is golden)

• dá- (“rather, fairly, quite”)

From Proto-Germanic *ala-, spelling due to influence of allr (“all”).

all-

1. Alternative spelling of al-

• all- in A Concise Dictionary of Old Icelandic, G. T. Zoëga, Clarendon Press, 1910, at Internet Archive.

From Proto-Celtic *alyos, from Proto-Indo-European *h₂élyos. Cognate with Old English el-, Ancient Greek ἄλλος (állos). (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

• IPA^(key): /aɬ/

all-

1. out, off, ex-, extra-

   Synonyms: ech-, es-

   ‎all- + ‎morio (“to travel by sea”) → ‎allforio (“to export”)

   ‎all- + ‎plyg (“folded”) → ‎allblyg (“extrovert”)

   ‎all- + ‎pwn (“load, burden”) → ‎allbwn (“output”)

2. other, allo-

   ‎all- + ‎tud (“people, nation”) → ‎alltud (“stranger; exile”)

   ‎all- + ‎ffôn (“phone”) → ‎allffon (“allophone”)

• mewn- (“in-”)

R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “all-”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies