Using the Indefinite Article | Greek Grammar

English has two ways to introduce a singular noun: a dog and one dog. Greek has one word for both — ένας / μία / ένα — and that single fact explains almost everything on this page. Because ένας is still transparently the numeral one, Greek reaches for it far less often than English reaches for a. Where English needs an article to make a sentence grammatical at all, Greek is perfectly happy with a bare noun. The mistake English speakers make here is almost never leaving ένας out; it is putting ένας in.

The forms themselves — ένας/έναν, μία/μια, ένα, and the genitives ενός/μίας — are set out on the indefinite article's declension. This page is about when.

What ένας actually does: introduce something new

The core job of ένας is to put a new, singular, not-yet-identified thing into the conversation. Once it is in, it switches to the definite article, exactly as English does.

Είδα έναν σκύλο έξω από την πόρτα και τρόμαξα.

ídha énan skílo ékso apó tin pórta ke trómaksa

I saw a dog outside the door and got a fright.

Μας τηλεφώνησε ένας κύριος από την τράπεζα, αλλά δεν άφησε όνομα.

mas tilefónise énas kírios apó tin trápeza, alá dhen áfise ónoma

A gentleman from the bank called us, but he didn't leave a name.

Ψάχνω ένα σπίτι με αυλή, όχι διαμέρισμα.

psáchno éna spíti me avlí, óchi dhiamérizma

I'm looking for a house with a yard, not an apartment.

Look at the third one: σπίτι gets ένα, διαμέρισμα gets nothing. Both are singular, both are indefinite. The difference is that σπίτι is a thing being looked for — one house, a specific-if-unknown one — while διαμέρισμα here names a category, not an item. That contrast is the engine of this whole topic.

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A useful test: if you could replace English a with one and the sentence still makes sense, Greek will use ένας. If you could replace it with nothing (I'm a teacher → I teach; not an apartment → not apartments), Greek will probably use nothing.

ένας meaning "a certain" — the unnamed source

A second everyday use is the one English covers with a friend of mine, this guy I know. Greek ένας flags that the speaker could identify the referent but is choosing not to.

Μου το είπε ένας φίλος, αλλά δεν ξέρω αν ισχύει.

mu to ípe énas fílos, alá dhen kséro an ischíi

A friend told me, but I don't know if it's true.

Δούλευε χρόνια σε μια εταιρεία στο Μαρούσι.

dhúleve chrónia se mia etería sto Marúsi

He worked for years at a company in Marousi.

For a stronger, vaguer "some ... or other," Greek switches to κάποιος: Μου το είπε κάποιος ("somebody told me" — I have no idea who). The pair ένας / κάποιος is covered on κάποιος and μερικοί.

Where Greek says nothing and English says "a"

This is the section to memorise. In all of the following, the bare noun is the correct form and inserting ένας is either wrong or changes the meaning.

1. Professions, roles, nationalities, religions after είμαι / γίνομαι

A noun after είμαι, γίνομαι, φαίνομαι is not a new thing being introduced — it is a label applied to the subject. Labels take no article. This is the single biggest source of the error.

Ο άντρας μου είναι ηλεκτρολόγος και δουλεύει νύχτες.

o ándras mu íne ilektrológhos ke dhulévi níchtes

My husband is an electrician and he works nights.

Έγινε δικηγόρος στα τριάντα του, μετά από άλλη καριέρα.

éyine dhikighóros sta triánda tu, metá apó áli kariéra

He became a lawyer in his thirties, after another career.

The one systematic exception: when the noun carries an evaluating adjective, it stops being a bare label and becomes a genuine description — and then ένας comes back.

Είναι ένας πολύ καλός γιατρός, τον εμπιστεύομαι απόλυτα.

íne énas polí kalós yatrós, ton embistévome apólita

He's a very good doctor — I trust him completely.

Compare bare Είναι γιατρός ("he's a doctor" — his job) with Είναι ένας πολύ καλός γιατρός ("he's a very good doctor" — a judgement). The full logic of what follows είμαι lives on the predicate nominative.

2. After ως ("as, in the capacity of")

ως takes a bare noun, always. (You will meet ένας after it only in the phrase ως ένας από..., "as one of...", where ένας is genuinely counting.)

Ως γονιός, καταλαβαίνω απόλυτα την ανησυχία σας.

os ghoniós, katalavéno apólita tin anisichía sas

As a parent, I completely understand your concern.

3. Mass nouns and unbounded quantities

Bread, water, time, money, work take no article in Greek when you mean an unspecified amount — just as English uses no article with them.

Αγόρασα ψωμί, τυρί και δυο ντομάτες για το βράδυ.

aghórasa psomí, tirí ke dhio domátes ya to vrádhi

I bought bread, cheese and a couple of tomatoes for tonight.

The trap is that some English a-nouns are mass nouns in Greek: Έχω δουλειά (I'm busy, lit. "I have work"), Έχω πυρετό (I have a fever). If it names a state rather than an object, expect a bare noun.

4. Exclamations with τι

English What a beautiful day! has an article; Greek τι takes the noun bare. There is no version of this with ένας.

Τι ωραία ιδέα! Γιατί δεν το σκεφτήκαμε νωρίτερα;

ti oréa idhéa! yatí dhen to skeftíkame norítera;

What a great idea! Why didn't we think of it earlier?

5. There is no indefinite plural

ένας has no plural. English some dogs / dogs corresponds to a Greek bare plural, or to μερικοί / κάτι if you want to stress "some."

Ήρθαν φίλοι από τη Θεσσαλονίκη και έμειναν τρεις μέρες.

írthan fíli apó ti Thesaloníki ke éminan tris méres

Some friends came from Thessaloniki and stayed three days.

There is simply no form of ένας that can sit in front of a plural noun. If you catch yourself hunting for one, the answer is to use nothing.

ένας as the number one

Because ένας is the numeral, Greek needs a way to force the counting reading. It does this the same way English does: with μόνο, with stress, or by putting ένας in contrast with another number.

Θέλω μόνο έναν καφέ, τίποτα άλλο.

thélo móno énan kafé, típota álo

I just want one coffee, nothing else.

Περίμενα μία ώρα και στο τέλος έφυγα.

perímena mía óra ke sto télos éfigha

I waited an hour and in the end I left.

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Masculine accusative έναν keeps its final -ν, exactly like τον: Είδα έναν σκύλο. Without the -ν, ένα is the neuter form, so dropping it can genuinely change which noun you appear to be talking about. Keep the -ν on έναν and you will never have to think about it again.

The expressive ένας — an intensifier, not an article

There is one more, thoroughly colloquial, use worth recognising: ένας before a noun with heavy intonation means "such a...". It is a Greek favourite in complaints and enthusiasms (informal).

Έχει μια ζέστη σήμερα που δεν βγαίνεις έξω.

échi mia zésti símera pu dhen vyénis ékso

It's so unbelievably hot today you can't go outside.

Μου έριξε ένα βλέμμα που πάγωσα.

mu érikse éna vléma pu pághosa

She gave me such a look that I froze.

Note that ζέστη is a mass noun — normally article-less — which is precisely why μια ζέστη reads as expressive rather than as counting. Compare the neutral Έχει ζέστη σήμερα ("it's hot today") with the theatrical Έχει μια ζέστη!: same words, different worlds.

Quick reference

English	Greek	Why
I saw a dog.	Είδα έναν σκύλο.	new, countable referent
She's a nurse.	Είναι νοσοκόμα.	role label after είμαι
She's a great nurse.	Είναι μια υπέροχη νοσοκόμα.	evaluation, not label
As a teacher, I…	Ως δάσκαλος, …	ως takes a bare noun
What a mess!	Τι χάλια!	τι takes a bare noun
I have a headache.	Έχω πονοκέφαλο.	state, not object
I want one coffee.	Θέλω έναν καφέ.	genuine counting

Common Mistakes

1. Putting ένας in front of a profession. The commonest single error English speakers make in Greek, and it is audible immediately.

❌ Η αδερφή μου είναι μια νοσοκόμα.

Incorrect — a role after είμαι takes no article.

✅ Η αδερφή μου είναι νοσοκόμα σε δημόσιο νοσοκομείο.

i adherfí mu íne nosokóma se dhimósio nosokomío

My sister is a nurse at a public hospital.

2. Translating "What a...!" word for word. τι never combines with ένας.

❌ Τι μια ωραία μέρα!

Incorrect — exclamative τι takes the noun bare.

✅ Τι ωραία μέρα! Πάμε μια βόλτα στη θάλασσα;

ti oréa méra! páme mia vólta sti thálasa;

What a beautiful day! Shall we go down to the sea?

3. Adding ένας after ως. English as a parent has an article; Greek's ως does not take one.

❌ Ως ένας δάσκαλος, βλέπω τη διαφορά.

Incorrect — ως + bare noun; ένας appears only in ως ένας από… ('as one of…').

✅ Ως δάσκαλος, βλέπω τη διαφορά κάθε χρόνο.

os dháskalos, vlépo ti dhiaforá káthe chróno

As a teacher, I see the difference every year.

4. Using ένας under negation. In a negated sentence ένας keeps its counting force, so the sentence comes out meaning something you did not intend.

❌ Δεν έχω ένα αυτοκίνητο.

Incorrect for 'I don't have a car' — this says 'I don't have one car' (implying: I have two).

✅ Δεν έχω αυτοκίνητο — παίρνω το μετρό.

dhen écho aftokínito — pérno to metró

I don't have a car — I take the metro.

5. Getting the gender of ένας wrong on -μα nouns. Nouns in -μα are neuter, however Latinate they look.

❌ Έχω μία πρόβλημα με το ίντερνετ.

Incorrect — πρόβλημα is neuter, so the form is ένα.

✅ Έχω ένα πρόβλημα με το ίντερνετ από το πρωί.

écho éna próvlima me to índernet apó to proí

I've had a problem with the internet since this morning.

Key Takeaways

ένας is still the numeral "one." That is why Greek uses it far less than English uses a.
Use it to introduce a new countable singular (Είδα έναν σκύλο) or to mean "a certain" (Μου το είπε ένας φίλος).
Do not use it for professions and roles after είμαι/γίνομαι (Είναι δικηγόρος), after ως, with mass nouns and states (Έχω δουλειά, Έχω πυρετό), or in exclamations with τι (Τι ωραία μέρα!).
An evaluating adjective flips the rule back on: Είναι ένας πολύ καλός γιατρός.
There is no indefinite plural — use a bare plural, or μερικοί / κάτι.
Masculine accusative is έναν with the -ν; without it you have written the neuter.
The expressive ένας before a mass noun (informal) means "such a…": Έχει μια ζέστη!

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