dertig

Dertig is the Dutch word for the number 30. It follows twintig and precedes eenendertig in the standard counting sequence. The numeral 30 is written as 30 and in Roman numerals as XXX. Dertig is used to express quantities, ages, prices, durations, and percentages, for example dertig euro, dertig minuten, or dertig procent.

Origin and form: The modern form dertig derives from Middle Dutch dertich, which itself comes from an older Germanic root. It is cognate with the German dreißig and related forms in other West Germanic languages. The spelling and pronunciation settled into the contemporary Dutch form over time.

Usage and context: 30 is an even, composite number with prime factors 2, 3, and 5. In Dutch, the term also appears in cultural expressions such as the Thirty Years' War, known in Dutch as the Dertigjarige Oorlog, and in demographic language as dertigers for people in their thirties. The word serves as a basis for phrases like in zijn dertiger jaren and dertig procent.