How to Say "century" in Spanish
The Spanish word for “century” is “siglo” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
nounB1
period of 100 years

Examples
El siglo XX fue un tiempo de grandes cambios tecnológicos.
The 20th century was a time of great technological changes.
Vivimos en el siglo veintiuno, pero aún tenemos que resolver problemas antiguos.
We live in the twenty-first century, but we still have old problems to solve.
Using Roman Numerals
Centuries are almost always written using Roman numerals (Siglo XXI, Siglo XV). When reading them aloud, use cardinal numbers (veintiuno, quince).
Gender Confusion
Mistake: “La siglo.”
Correction: Always use the masculine article: 'El siglo'. All nouns ending in '-o' are typically masculine.
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