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It is an Austronesian language with many words of Portuguese and Malay origin.

Republika Demokrátika Timor (Lorosae), is a country in Southeast Asia. Timor is an island south of Insulindia, divided between the independent state of East Timor and West Timor, part of the Indonesian province of East Nusa Tenggara.

Tetum developed as a contact language during the 16th century, following Portuguese colonization.
The Tetum name for East Timor is Timor Lorosae, or 'country of the rising sun,' which is the country's official name.