Sala de lectură este liniștită.

• sala = the room / the hall
• de = of / for
• lectură = reading
• este = is
• liniștită = quiet

A natural English translation is The reading room is quiet.

Because Romanian usually puts the definite article at the end of the noun.

• sală = a room / a hall
• sala = the room / the hall

For many feminine nouns ending in -ă, the definite singular form ends in -a:

• o sală = a room
• sala = the room

So sala de lectură means the reading room.

Literally, de lectură means of reading or for reading.

In natural English, we usually turn that into reading:

• sală de lectură = reading room

Romanian often uses noun + de + noun where English uses a compound noun or an adjective. For example:

• sală de sport = gym, sports hall
• ochelari de soare = sunglasses

So here de lectură tells you the room’s purpose.

No. This is a very common false friend.

• lectură = reading
• lecture in the English sense is usually prelegere or sometimes curs, depending on context

So sala de lectură is not a lecture room. It is a room meant for reading.

Because after de in this kind of expression, Romanian normally uses the bare noun.

So:

• sală de lectură = room for reading
• sala de lectură = the reading room

The first noun can be definite or indefinite depending on the sentence, but the second noun usually stays indefinite in this type of phrase. It names a category or purpose, not a specific reading.

Este is the 3rd person singular of a fi, meaning to be. It means is.

In a normal sentence like this, Romanian keeps the verb:

• Sala de lectură este liniștită = The reading room is quiet

In everyday speech, it is very common to shorten este to e:

• Sala de lectură e liniștită

But you normally would not just leave it out completely in standard speech.

Because Romanian adjectives agree with the noun in gender and number.

Sala is feminine singular, so the adjective must also be feminine singular:

• liniștit = quiet, masculine singular
• liniștită = quiet, feminine singular

Compare:

• un loc liniștit = a quiet place
• o sală liniștită = a quiet room

So Sala de lectură este liniștită is grammatically matched.

This word order is the normal, neutral one:

subject + verb + adjective
Sala de lectură este liniștită.

Romanian does allow other word orders, but they usually add emphasis or sound more literary. For a learner, this is the safest and most natural order to use.

A rough English-style approximation is:

SA-la de lek-tu-RUH YES-te lee-neesh-TEE-tuh

A few useful sound notes:

• ș sounds like English sh
• ă sounds like the a in sofa
• lectură is stressed on the last syllable: lec-tu-RĂ
• liniștită is stressed on ti: li-niș-TI-tă

So the last word is not LINIȘTITĂ with stress at the beginning, but liniș-TI-tă.