iso

Pronunciation: /ˈiso/

“iso” is a Finnish word. Its 7 meanings in English:

adjective

big, large, great (of a great size)
big, grown-up
great (powerful; important; influential)
grand (standing in the second or more remote degree of parentage)
capital, uppercase, majuscule

noun

synonym of isä (“father”)
main; ellipsis of isopurje (“mainsail”)

Etymology

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 are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.