Countability and Partitive Constructions | Romanian Grammar

Some nouns name things you can count one by one — un măr (an apple), două mere (two apples) — and some name substances that come as undivided stuff: apă (water), zahăr (sugar), pâine (bread), vin (wine). English speakers already know the count-vs-mass split ("two apples" but not "two waters"); the question this page answers is how Romanian *grammaticalizes it — which quantifiers a mass noun takes, how you carve a portion out of it, and what happens when you try to pluralize it anyway. The companion page on collective and mass noun types catalogues which nouns are mass; this page is about the partitive grammar — the construction machinery you wrap around them.

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The core partitive frame is measure/container + de + substance: un pahar de apă (a glass of water), un kilogram de mere (a kilo of apples), o felie de pâine (a slice of bread). The little de is the hinge that links "how much / what container" to "of what". You cannot drop it.

Mass nouns take niște and puțin, not un

A mass noun normally rejects the indefinite article un/o in its bare sense, because un/o means "one (countable) unit", and a substance has no units. To say "some water" or "a bit of sugar", Romanian reaches for the quantifiers niște ("some") and puțin/puțină ("a little"), which are built for uncountable amounts.

Vrei niște apă? Pare că ți-e sete.

Do you want some water? You look thirsty.

Pune puțin zahăr în cafea, nu mult.

Put a little sugar in the coffee, not a lot.

Mai avem niște pâine de ieri.

We still have some bread from yesterday.

Puțin agrees in gender with its noun (puțin zahăr but puțină apă, puțină sare), exactly because it behaves like an adjective-quantifier; niște is invariable and the most general "some" for both mass and plural-count nouns. The broader system of these words is laid out in quantifiers.

Mai e puțină cafea în ibric?

Is there a little coffee left in the pot? (puțină — feminine agreement with cafea)

Carving a portion: the measure + de frame

To talk about a definite amount of a substance, you name a container or a measure and link it to the substance with de. This is the partitive construction, and the de is obligatory — it is the join that makes "a glass" be "a glass of water".

Measure / container	de +	Substance	Meaning
un pahar	de	apă	a glass of water
o sticlă	de	vin	a bottle of wine
o felie	de	pâine	a slice of bread
un kilogram	de	mere	a kilo of apples
o cană	de	lapte	a mug of milk

Aș vrea un pahar de apă, vă rog.

I'd like a glass of water, please.

Am comandat o sticlă de vin roșu pentru toți.

I ordered a bottle of red wine for everyone.

Dă-mi, te rog, o felie de pâine.

Pass me a slice of bread, please.

Am cumpărat un kilogram de mere și o jumătate de pepene.

I bought a kilo of apples and half a watermelon.

Notice the substance after de stays bare and singular for true mass nouns (de apă, de vin, de pâine) — there is no article and no plural, because you are naming the substance generically, not a specific portion of it. With a count noun used by weight, the noun goes plural (un kilogram de mere, "a kilo of apples"), since you are weighing a heap of countable items.

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English uses "of" for this and so reaches for the Romanian preposition learners expect to be din or a possessive — but the partitive join is plain de: un pahar de apă, not ~~un pahar din apă~~ (that would mean "a glass from/out of the water," a different, partitive-from-a-specific-source sense). Default to de.

din vs de: a real but narrow contrast

There is a genuine contrast worth flagging honestly. De introduces the kind of substance generically (un pahar de vin = "a glass of wine", any wine). Din ("from / out of") points to a specific mass already in view (un pahar din vinul ăsta = "a glass of this wine", drawn out of that particular bottle). Most of the time you want de; reach for din only when you are partitioning a specific, definite quantity.

Toarnă-mi un pahar din vinul pe care l-ai adus tu.

Pour me a glass of the wine you brought. (din + definite → out of that specific wine)

Vreau o felie din tortul de ciocolată, nu din celălalt.

I want a slice of the chocolate cake, not the other one. (din — a specific cake)

Pluralizing a mass noun shifts its meaning to "kinds of"

You can put a mass noun in the plural — but doing so changes what it means. The plural of a substance noun denotes types, varieties, or servings of it, not "more of the same stuff". Vin (wine) → vinuri (wines, i.e. kinds of wine); brânză (cheese) → brânzeturi (cheeses, varieties of cheese); apă (water) → ape (waters, e.g. bodies of water or mineral-water types). This is a systematic, productive shift, and it is exactly parallel to English "two coffees" meaning two cups or two kinds.

Mass (singular)	Plural	Shifted meaning
vin (wine)	vinuri	wines / kinds of wine
brânză (cheese)	brânzeturi	cheeses / varieties
bere (beer)	beri	beers / kinds (or servings)
ceai (tea)	ceaiuri	teas / kinds of tea

Restaurantul are o listă lungă de vinuri românești.

The restaurant has a long list of Romanian wines (kinds of wine).

La piață găsești tot felul de brânzeturi de munte.

At the market you find all sorts of mountain cheeses.

Magazinul ăsta vinde numai ceaiuri de plante.

This shop sells only herbal teas (kinds of tea).

When o apă is fine — the colloquial container ellipsis

The rule that mass nouns reject un/o has a real-life loophole worth being honest about. In casual speech, especially when ordering, Romanians do say o apă, o bere, o cafea — but only because the container or serving is understood: o apă = "a (bottle of) water", o bere = "a (glass of) beer". The un/o is counting the implied unit, not the substance. So this is not a counterexample to the rule; it is the partitive frame with the measure word dropped.

Două beri și o apă plată, vă rog.

Two beers and a still water, please. (counting servings — measure word understood)

Mai aduceți-mi o cafea, vă rog.

Bring me another coffee, please. (o cafea = a cup of coffee)

Common Mistakes

❌ un pahar apă

Incorrect — the partitive needs de to join measure and substance: un pahar de apă.

✅ un pahar de apă

a glass of water

❌ Vreau un zahăr în cafea.

Incorrect — zahăr is a mass noun; for an amount use puțin: pune puțin zahăr (or 'un cub de zahăr' for a counted lump).

✅ Pune puțin zahăr în cafea.

Put a little sugar in the coffee.

❌ un pahar de apă rece (intending 'a glass of the cold water on the table')

Ambiguous — for a specific, definite mass use din: un pahar din apa rece de pe masă.

✅ un pahar din apa de pe masă

a glass of the water on the table

❌ Am cumpărat mulți vin.

Incorrect — 'a lot of wine' uses mult (mass), not mulți (count-plural): mult vin; vinuri would mean 'kinds of wine'.

✅ Am cumpărat mult vin.

I bought a lot of wine.

❌ un kilogram de măr

Incorrect — by weight the count noun goes plural: un kilogram de mere.

✅ un kilogram de mere

a kilo of apples

Key Takeaways

Mass nouns take niște ("some") and puțin/puțină ("a little"), not the counting article un/o in their bare sense.
The partitive frame is measure/container + de + substance: un pahar de apă, un kilogram de mere. The de is obligatory.
After de, a true mass noun stays bare and singular (de apă); a count noun by weight goes plural (de mere).
Use din (not de) when partitioning a specific, definite mass: un pahar din vinul ăsta.
Pluralizing a mass noun shifts it to "kinds / varieties of": vin → vinuri, brânză → brânzeturi.
Colloquial o apă, o bere is the partitive frame with the container word understood, not a real exception.

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