Majoritatea oamenilor sunt aici.

Because majoritatea is the definite form of majoritate.

• majoritate = majority
• majoritatea = the majority

Romanian usually puts the definite article at the end of the noun, instead of using a separate word like English the.

After majoritatea, Romanian normally uses the next noun in the genitive:

• majoritatea oamenilor = the majority of the people

So oamenilor is not just a random plural form; it is the form required by this structure.

A quick comparison:

• oameni = people (basic plural)
• oamenii = the people (subject/object form)
• oamenilor = of the people / to the people (genitive/dative plural definite)

In this sentence, majoritatea needs oamenilor.

It is genitive plural here.

Romanian uses the same form for genitive and dative in many cases, so oamenilor can mean either:

• of the people in a genitive structure
• to the people in a dative structure

In Majoritatea oamenilor, it is clearly genitive because it depends on majoritatea.

This is a very common learner question.

Grammatically, majoritatea is singular, but it refers to many individual people, so Romanian often uses plural agreement by meaning:

• Majoritatea oamenilor sunt aici.

This is very natural and common.

You may also encounter singular agreement in some contexts, especially when the speaker treats the group more as one unit, but plural is the form many learners will hear most often in everyday Romanian with this kind of meaning.

Because Romanian often makes both parts definite in this kind of phrase.

• majoritatea = the majority
• oamenilor = of the people

So the structure is basically the majority of the people.

This is normal Romanian usage. It may feel different from English, but it is the standard pattern.

Not in this sentence.

The normal Romanian pattern is:

• majoritatea + genitive noun
• majoritatea oamenilor

Using de here is not the standard way to build this phrase. A native speaker would expect oamenilor, not de oameni, in this structure.

Yes, Romanian word order is fairly flexible.

The given sentence:

• Majoritatea oamenilor sunt aici.

is the most neutral and straightforward order.

You can also move aici for emphasis:

• Aici sunt majoritatea oamenilor.

That can sound more contrastive, as if you are emphasizing here rather than somewhere else.

So the original order is the safest default for learners.

They are similar, but not identical.

• majoritatea oamenilor = the majority of the people
• cei mai mulți oameni = most people

A useful way to think about it:

• majoritatea oamenilor often sounds a bit more like a defined group
• cei mai mulți oameni can sound more general

In many everyday situations, though, they can overlap in meaning.

The singular is om.

So the pattern is:

• om = person / man
• oameni = people
• oamenilor = of the people / to the people

This is a very common noun, and its plural does not look completely predictable at first, so it is worth memorizing.

Because Romanian usually does not need a subject pronoun when the subject is already clear.

Here, the subject is explicitly stated:

• Majoritatea oamenilor

And the verb form sunt also helps show the meaning.

Adding ei would usually sound unnecessary unless you wanted extra emphasis or contrast.