Poliția ajunge repede.

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

• poliție = police / a police force in a general sense
• poliția = the police

So the -a at the end shows definiteness.

In Romanian, poliția is grammatically singular, even though in English the police often takes a plural verb.

So Romanian says:

• Poliția ajunge = literally the police arrives

This is normal in Romanian because poliția is treated as a singular noun referring to the institution or force.

Ajunge is the 3rd person singular present tense form of the verb a ajunge.

Here it agrees with poliția, which is singular.

So:

• a ajunge = to arrive, to get to, to reach
• ajunge = arrives / gets there / reaches

Not always. A ajunge can have several related meanings, depending on context:

• to arrive
• to get to
• to reach
• sometimes to become in certain structures

In Poliția ajunge repede, the natural meaning is arrives quickly or gets there quickly.

Repede is an adverb, meaning quickly or fast.

It modifies the verb ajunge, telling you how the police arrives.

Adverbs in Romanian do not change form for gender or number, so repede stays the same.

That is a very common word order in Romanian:

• subject + verb + adverb

So Poliția ajunge repede is the most neutral way to say it.

You may also hear:

• Poliția repede ajunge — possible only in special styles or with unusual emphasis, but not the normal everyday order
• Repede ajunge poliția — possible for emphasis, but less neutral

The standard sentence is Poliția ajunge repede.

A helpful approximate pronunciation is:

po-li-TSI-a

More exactly, the ț sounds like ts in cats.

So:

• poliția ≈ po-lee-TSEE-ah

Also note that the ending is pronounced in separate vowel sounds: -ți-a, not as one English-style syllable.

The Romanian letter ț represents the sound ts.

So:

• ț = ts

This is different from plain t.

For an English speaker, that means poliția should not sound like politia with a simple t sound. It needs the ts sound: po-li-tsi-a.

Yes, but the meaning changes.

Romanian often drops the subject pronoun when the verb form already shows the person. However, here ajunge by itself only means:

• he/she/it arrives quickly

Without poliția, you no longer know that the subject is the police.

So if you want to say specifically the police arrives quickly, you should keep poliția.

Yes. It is complete, grammatical, and natural.

It has:

• a subject: Poliția
• a verb: ajunge
• an adverb: repede

It sounds like a simple everyday statement meaning that the police arrives quickly or gets there quickly.

Yes. Depending on nuance, Romanian could also use verbs like vine or sosește.

For example:

• Poliția vine repede = The police comes quickly
• Poliția sosește repede = The police arrives quickly
• Poliția ajunge repede = The police gets there quickly / arrives quickly

Ajunge often suggests successfully getting to the place, so it works very well in this kind of sentence.