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FINNISH · A WORD WITH POSSIBILITIES

iso.

big, large, great (of a great size)

3 characters2 syllables approx.Suomi language

Meaning & usage

adj/ˈiso/[ˈis̠o̞]
  1. big, large, great (of a great size)

    isoympyrä
  2. big, grown-up

    olet jo iso poika
  3. great (powerful; important; influential)

    Iso-Britannia
  4. grand (standing in the second or more remote degree of parentage)

    isoisä
    isoäiti
  5. capital, uppercase, majuscule

    iso kirjain
Where this word comes from

From isä (“father”) + -o, through an earlier form isoi (attested in Agricola). SSA considers this word 'primarily western (Finnish)', although SMS remarks it is common in all dialect regions except Central and South Karelia. First attested as jso in c. 1401. The original senses probably were “father” as a noun, thence “big, grown-up, adult” as an adjective.

noun/ˈiso/[ˈis̠o̞]
  1. synonym of isä (“father”)

    archaic · poetic
  2. main; ellipsis of isopurje (“mainsail”)

    slang
Where this word comes from

From isä (“father”) + -o, through an earlier form isoi (attested in Agricola). SSA considers this word 'primarily western (Finnish)', although SMS remarks it is common in all dialect regions except Central and South Karelia. First attested as jso in c. 1401. The original senses probably were “father” as a noun, thence “big, grown-up, adult” as an adjective.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.