Lumea este mare.

Because -a at the end is the Romanian definite article attached to the noun.

• lume = world
• lumea = the world

Unlike English, Romanian usually puts the at the end of the noun instead of using a separate word before it.

So:

• lume = world
• lumea = the world

Romanian normally uses a postposed definite article, which means the article is attached to the end of the noun.

In English:

• the world

In Romanian:

• lumea

This is one of the first big differences English speakers notice in Romanian.

Este means is.

It is the 3rd person singular form of the verb a fi = to be.

So:

• eu sunt = I am
• tu ești = you are
• el/ea este = he/she is

In Lumea este mare, este links the subject (lumea) with the description (mare), just like is in English.

Yes. Lumea e mare is completely normal and very common.

• este = full form
• e = shorter form of is

Both are correct:

• Lumea este mare.
• Lumea e mare.

The version with este can sound a little more careful or formal, while e is very common in everyday speech.

Mare means big or large.

In this sentence, it comes after este because it is a predicate adjective:

• Lumea = the world
• este = is
• mare = big

So the structure is very similar to English:

• The world is big.

Not in this form.

Lumea is feminine singular, but mare already has the correct singular form, and that form is the same for both masculine and feminine singular.

Examples:

• un oraș mare = a big city/town
• o lume mare = a big world

The plural is different:

• mari = big (plural)

So:

• singular: mare
• plural: mari

A simple English-friendly approximation is:

LOO-meh-ah YES-teh MAH-reh

A few notes:

• lu sounds like loo
• e is usually like eh
• r is usually tapped or lightly rolled, not the English r
• the final vowels are pronounced clearly, not swallowed

A more careful pronunciation of lumea is roughly LOO-meh-ah, with the ea pronounced together smoothly.

No, this is a very straightforward Romanian sentence.

It follows the pattern:

subject + verb + adjective

• Lumea = subject
• este = verb
• mare = adjective

So it works very much like English:

• The world is big.

Yes. Lume can also mean people or the public in some contexts, and lumea can mean the people, everyone, or the world, depending on context.

For example:

• Toată lumea știe. = Everyone knows.

But in Lumea este mare, the natural meaning is The world is big.

Yes. It is correct and natural Romanian.

It is also a very useful beginner sentence because it shows several important things clearly:

• the noun with attached definite article: lumea
• the verb este
• a common adjective: mare
• normal sentence order

So it is both grammatical and good for learning.

Yes, in a normal statement like this, Romanian uses the verb a fi just like English uses to be.

So:

• Lumea este mare. = correct
• Lumea mare. = not a normal complete sentence for this meaning

If you want to say The world is big, you need este or the shorter e.

Because it is the first word of the sentence.

It is not capitalized because it is a special noun or proper name. In the middle of a sentence, it would normally be written lumea, not Lumea.