The Oromo Alphabet (Qubee)

Oromo (Afaan Oromoo, ISO 639-3: orm) is an Afro-Asiatic Cushitic language with approximately 37–40 million speakers — the most widely spoken Cushitic language and one of the most spoken languages in Africa. The Oromo are the largest ethnic group in Ethiopia ^[1].

Oromo belongs to the Lowland East Cushitic branch alongside Somali and Afar. The Qubee Latin alphabet, adopted in 1991, uses 29 letters including digraphs for the retroflex dh (/ɖ/), ejective ph (/pʼ/), and palatal nasal ny (/ɲ/) ^[2].

Qubee is the official Latin alphabet for Oromo, adopted in 1991. Before Qubee, Oromo was written in Ethiopic Fidel — which did not precisely represent Oromo phonology. Qubee replaced Fidel to give Oromo a phonologically accurate writing system ^[2].

Qubee has 29 base letters — 5 vowels and 24 consonants — plus long vowels (aa, ee, ii, oo, uu). The seven digraphs (ch, dh, ny, ph, sh, ts, zh) each represent a distinct Oromo phoneme. Every letter has a consistent, predictable pronunciation ^[1].

Oromo belongs to the Afro-Asiatic → Cushitic → Lowland East Cushitic branch. Its closest relatives are Somali and Afar — the three languages share many cognate numeral words and a common Cushitic ancestor ^[1].

The Cushitic branch also includes North Cushitic (Beja), Highland East Cushitic (Sidamo), and South Cushitic (Iraqw). Oromo and Somali together account for over 60 million speakers — the two largest Cushitic languages by far ^[2].

Oromo is spoken primarily in the Oromia Region of Ethiopia — the country's largest regional state. Major Oromo-speaking cities include Jimma, Adama, Dire Dawa, Harar, and Nekemte ^[1].

Oromo is also spoken in northern Kenya (as Borana/Orma) and parts of Somalia and Djibouti. It is an official working language of Oromia, used in schools, government, the Oromia Broadcasting Network, and increasingly in higher education ^[2].

The retroflex stop dh (/ɖ/) is produced with the tongue tip curled back against the post-alveolar region — giving a deeper, hollow quality compared to plain d. Dh and d are phonemically distinct in Oromo — changing one for the other changes word meaning ^[2].

Retroflex consonants are absent from English, French, and Arabic but common in Indian languages (Hindi ड) and Cushitic languages including Somali and Oromo. The Qubee digraph "dh" clearly distinguishes this phoneme from plain "d" in writing ^[1].

Oromo and Somali are both Lowland East Cushitic languages sharing a common ancestor. Cognate numerals confirm the relationship: Oromo shan (five) = Somali shan; Oromo sagal (nine) = Somali sagaal; Oromo torba (seven) = Somali toddoba ^[1].

Both languages have the retroflex dh (/ɖ/), uvular q, and vowel length written by doubling. Despite these similarities, Oromo and Somali are not mutually intelligible — they have diverged significantly in vocabulary, grammar, and phonology ^[2].

Oromo has several major dialect groups: West-Central (Wallaga, Tulama), Borana-Arsi-Guji (southern Ethiopia and northern Kenya), Harar (eastern Ethiopia), and Raya (northern Oromia). Despite regional variation, all dialects are mutually intelligible ^[1].

The Borana dialect is notable for its large presence in northern Kenya, spoken alongside Swahili and English. Qubee is the shared written standard across all dialects, enabling speakers from different regions to read the same material ^[3].

Natural language processing (NLP) research for Oromo has grown significantly, with published work on spell-checking, machine translation, speech recognition, and large language model applications. Oromo is one of the best-resourced indigenous African languages for NLP ^[3].

NLP tools for Oromo use Qubee as input and output. Research from Ethiopian universities and published on arxiv.org has expanded Oromo's digital infrastructure, supporting education and communication technology for the ~40 million speaker community ^[3].