Arabic

Suffix

ـُون • ‎(-ūn) m

1. Nominative-case (marfūʿ) suffix used to pluralize masculine nouns and adjectives referring to people. In Classical Arabic, with full ʾiʿrāb, appears as ـُونَ ‎(-ūna). Note that most masculine nouns and adjectives referring to people, especially shorter ones, are not pluralized in this fashion, but use a broken plural instead. Furthermore, non-human masculine nouns don't use this suffix, either forming a broken plural or using the "feminine" suffix ـَات ‎(-āt).
2. Nominative-case (marfūʿ) suffix used very occasionally to pluralize non-human nouns, including some that are feminine, such as سَنَة ‎(sana, “year”), plural سِنُون ‎(sinūn).

See also

• ـِين ‎(-īn) (for the accusative and genitive cases)

Persian

Etymology 1

From English van.

Noun

ون • ‎(van) ‎(plural ون‌ها ‎(van-hâ))

1. van

Etymology 2

From Middle Persian wn' ‎(wan, “tree”).

Noun

ون • ‎(van)

1. ash tree

Etymology 3

From Arabic

Suffix

ـون • ‎(-un)

1. (rare, literary) A suffix forming the plural of nouns (usually of Arabic origin) ending in ـی ‎(-i)

Derived terms

• انقلابیون ‎(enqelâbiyyun)
• روحانیون ‎(rowhâniyyun)
• افراطیون ‎(efrâtiyyun)
• اعتدالیون ‎(e'tedâliyyun)
• ملیون ‎(melliyyun)
• اجتماعیون ‎(ejtemâ'iyyun)
• جبریون ‎(jabriyyun)
• اختیاریون ‎(extiyâriyyun)
• الهیون ‎(elâhiyyun), الاهیون ‎(elâhiyyun)
• مادیون ‎(mâddiyyun)
• طبیعیون ‎(tabi'iyyun)
• داعشیون ‎(dâ'ešiyyun)