Oromo is the most widely spoken of the Cushitic languages, a family which includes the Somali language. It is an official language in Ethiopia and is also spoken in Kenya, Somalia, Eritrea and Djibouti. There are many dialects of Oromo - not all of them understandable by speakers of other dialects - which tend to borrow words from neighbouring languages. For example, the Oromo of Ethiopia may borrow Amharic words.
