Masculine nouns ending in -ma (-ma, -mi)

In Italian, most nouns that end in -a are feminine. However, an important exception is a group of masculine nouns ending in -ma. Many of these words come from ancient Greek and are used to discuss complex concepts.

Masculine Singular: -ma

These nouns take masculine singular articles (like il, l', or un) and masculine adjectives.

This is a difficult system that I don't understand.
Questo è un sistema difficile che non capisco.
This is not a real dilemma for me at all.
Questo non è mica un vero dilemma per me.

Masculine Plural: -mi

To make these nouns plural, the final -a changes to -i, making the ending -mi. Remember to match them with masculine plural articles (like i, gli, or questi) and adjectives.

The new systems are not better, they are worse.
I nuovi sistemi non sono migliori, sono peggiori.
We have two difficult dilemmas to solve.
Abbiamo due dilemmi difficili da risolvere.
The themes of the book are very interesting.
I temi del libro sono molto interessanti.

Notice how the plural article acts exactly as it would for any other masculine noun. For example, masculine nouns starting with a vowel take gli (or quegli for "those"):

Those enigmas are the worst.
Quegli enigmi sono i peggiori.

Academic and Abstract Themes

You will encounter this -ma to -mi pattern constantly when talking about academic subjects, literature, and science.

This theorem is very difficult.
Questo teorema è molto difficile.
The new paradigms change the world.
I nuovi paradigmi cambiano il mondo.
The students received their diplomas.
Gli studenti hanno ricevuto i diplomi.
The epic poems that we read are very famous.
I poemi che abbiamo letto sono molto famosi.