Learned Feminines: η πόλη → οι πόλεις

Some of the most frequent nouns in Greek belong to a class that looks, in the singular, exactly like an ordinary feminine in -η — but pluralises in a way that catches every learner off guard. η πόλη (city) becomes οι πόλεις; η δύναμη (strength, power) becomes οι δυνάμεις; η τάξη (class, order) becomes οι τάξεις; η λέξη (word) becomes οι λέξεις. These are the learned feminines — words inherited more directly from Ancient Greek, where they ended in -ις (ancient πόλις). Their origin is old and bookish; their usage is anything but. City, power, class, word, thought, situation, decision — you meet them in the first weeks and use them forever. Master this class despite the "learned" label, not around it.

The full paradigm

Here is η πόλη in every cell. Notice that the singular is a completely normal -η feminine; all the action is in the plural.

Two forms are the signature of the class:

• Nominative / accusative plural in -εις: οι πόλεις, τις πόλεις. Where a regular feminine would give ×οι πόλες, this class gives οι πόλεις.
• Genitive plural in -εων: των πόλεων. This is unique — no other feminine class has it. Compare των δυνάμεων, των τάξεων, των λέξεων.

The genitive singular is the ordinary -ης of any -η feminine: της πόλης, της δύναμης. (A formal, older variant in -εως — της πόλεως, της κυβερνήσεως — survives in officialese, signage and set phrases; more on that below.)

The accent trick: proparoxytones move forward in the plural

Watch the stress carefully, because it behaves in a way the singular doesn't warn you about. Nouns stressed on the third-from-last syllable in the singular (proparoxytones) shift the accent one syllable toward the end in the plural:

• η δύναμη → οι δυνάμεις → των δυνάμεων
• η κατάσταση → οι καταστάσεις → των καταστάσεων
• η κυβέρνηση → οι κυβερνήσεις → των κυβερνήσεων

The plain -η feminines never do this; η αγάπη stays αγάπη → αγάπες. This forward jump is a fingerprint of the learned class. Nouns already stressed nearer the end (πόλη, τάξη, λέξη, θέση) keep their accent put: η πόλη → οι πόλεις → των πόλεων.

Which nouns are in this class?

The membership is learnable because the words cluster by ending. Reliable members include:

The practical rule of thumb: feminine nouns ending in -ση, -ξη, -ψη are almost all in this class (θέση, τάξη, σκέψη, and the whole productive family of verbal nouns like απόφαση, κατάσταση, αίσθηση, κυβέρνηση), plus a short list of very common others led by πόλη and δύναμη. If a feminine -η noun does not end that way (αγάπη, νίκη, τέχνη, φωνή), it is almost certainly a regular feminine in -η with a plain -ες plural.

The -εις plural is not a verb ending — the article tells you

Here is the pitfall that unsettles readers. The plural ending -εις is spelled and pronounced identically to a verb ending: γράφεις means "you write," θέλεις means "you want." So on the page, πόλεις and γράφεις rhyme perfectly. How do you know οι πόλεις is a noun ("the cities") and not a verb?

The article and the context decide. A noun in -εις is virtually always sitting behind a feminine plural determiner — οι, τις, των, or a number/adjective: οι πόλεις, τις αποφάσεις, πολλές λέξεις, τρεις θέσεις. A verb has a subject and no such article. Once you register that οι/τις/των + -εις = "the cities / decisions," the resemblance to γράφεις stops being confusing.

A register footnote: -εως vs -ης in the genitive singular

The everyday genitive singular of this class is the plain -ης: της πόλης μας ("of our city"), της κυβέρνησης. But the class also keeps an older, formal genitive singular in -εως: της πόλεως, της κυβερνήσεως, της τάξεως. You will meet it on official signs, in legal and administrative prose, in newspaper headlines and in frozen expressions — never in casual chat. Treat -εως as the (formal) dress and -ης as the everyday clothes for the same word. This is one of many Ancient/Modern pairs covered under learned doublets.

Common Mistakes

1. Regularising the plural to -ες. This class never takes -ες; it takes -εις.

2. Using -ων instead of -εων in the genitive plural. The genitive plural of this class is the distinctive -εων. (των πόλων would be "of the poles" — a different word, ο πόλος!)

3. Forgetting the accent shift on proparoxytones. η δύναμη moves its stress forward in the plural.

4. Treating -εις as a singular. -εις is plural; the singular is -η.

Key Takeaways

• A learned, Ancient-derived class of feminines ends in -η in the singular but takes the plural -εις: η πόλη → οι πόλεις, η δύναμη → οι δυνάμεις, η λέξη → οι λέξεις.
• Its signatures are the -εις plural and the unique genitive plural -εων (των πόλεων, των δυνάμεων).
• Proparoxytones shift their accent forward in the plural: η δύναμη → οι δυνάμεις; πόλη/τάξη/λέξη keep theirs.
• Spot the members by ending: -ση, -ξη, -ψη nouns plus πόλη, δύναμη belong here; αγάπη, νίκη, τέχνη do not.
• The -εις plural looks like a verb ending (γράφεις), but a feminine plural article (οι/τις/των) marks it as a noun; and a formal genitive singular -εως (της πόλεως) shadows the everyday -ης.