Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Proto-Indo-European *óynos

→ English one (inherited)
→ Afrikaans een (inherited)
→ Aragonese uno (inherited)
→ Assamese এক (inherited)
→ Assamese এ- (derived)
→ Assamese আক (inherited)
→ Asturian unu (inherited)
→ Belarusian адзін (derived)
→ Bulgarian един (derived)
→ Bhojpuri एगो (inherited)
→ Bengali এক (inherited)
→ Breton un (inherited)
→ Breton unan (derived)
→ Catalan un (inherited)
→ Corsican un (inherited)
→ Corsican unu (inherited)
→ Czech jeden (derived)
→ Kashubian jeden (derived)
→ Welsh un (inherited)
→ Danish en (inherited)
→ Danish nul (derived)
→ German Null (mention)
→ Lower Sorbian jaden (mention)
→ Middle Dutch een (inherited)
→ Dhivehi އެކެއް (derived)
→ Spanish un (inherited)
→ Spanish uno (inherited)
→ Fala un (inherited)
→ Fala un-a (derived)
→ Faroese ein (inherited)
→ French un (inherited)
→ North Frisian ån (inherited)
→ Irish aon (inherited)
→ Irish Aonghas (derived)
→ Scottish Gaelic aon (inherited)
→ Scottish Gaelic Aonghas (inherited)
→ Westrobothnian ajn (inherited)
→ Gutnish ajn (inherited)
→ Old Swedish en (inherited)
→ Jersey Dutch en (inherited)
→ Gothic 𐌰𐌹𐌽𐍃 (inherited)