Ideea rămâne în mintea mea.

Because Romanian usually puts the definite article at the end of the noun, not as a separate word like English the.

• idee = idea
• ideea = the idea
• minte = mind
• mintea = the mind

So in this sentence, both nouns are definite:

• Ideea = the idea
• mintea = the mind

This is very normal in Romanian.

The base word is idee. When the definite article -a is added, you get idee + a = ideea.

So the double e is not random spelling; it shows the original noun plus the attached article.

• idee → ideea
• alee → aleea
• femeie → femeia

For an English speaker, it can look strange at first, but it is a regular pattern.

In Romanian, when a noun is followed by a possessive like mea (my), the noun is usually in the definite form.

So:

• cartea mea = my book
• casa mea = my house
• mintea mea = my mind

That is why minte mea sounds wrong in standard Romanian. The normal form is mintea mea.

Because Romanian possessives usually come after the noun.

So:

• cartea mea = my book
• gândul meu = my thought
• mintea mea = my mind

This is one of the big differences from English. English says my mind; Romanian usually says the equivalent of the mind my.

Also, mea agrees with the noun:

• mea for feminine singular nouns
• meu for masculine/neuter singular nouns

Since minte is feminine, you get mea.

Rămâne is the 3rd person singular present tense of the verb a rămâne, meaning to remain / to stay.

So:

• eu rămân = I remain
• tu rămâi = you remain
• el/ea rămâne = he/she/it remains

The subject here is ideea, which is singular, so the verb is singular too:

• Ideea rămâne = The idea remains

Because a rămâne adds the idea of continuing or staying.

Compare:

• Ideea este în mintea mea = The idea is in my mind
• Ideea rămâne în mintea mea = The idea remains/stays in my mind

So rămâne suggests persistence: the idea does not go away.

În means in / inside. Here it marks location, even though the location is mental rather than physical.

So:

• în casă = in the house
• în oraș = in the city
• în mintea mea = in my mind

Romanian uses în very naturally for this kind of metaphorical location.

This is the most neutral, straightforward word order:

subject + verb + prepositional phrase

• Ideea = subject
• rămâne = verb
• în mintea mea = location/complement

Romanian word order is more flexible than English, so other orders are possible for emphasis, for example:

• În mintea mea rămâne ideea

But the original sentence is the most neutral and natural way to present it.

A rough guide is:

i-de-E-a rə-MÂ-ne în MIN-tea MEA

A few helpful notes:

• ă in rămâne is like the a in sofa
• â in rămâne and în is a specifically Romanian vowel with no exact English equivalent
• mintea sounds roughly like MINT-ya
• ideea is pronounced with all the vowels heard: i-de-e-a

So don’t compress ideea too much; Romanian keeps those vowels separate.

Minte means mind, intellect, or thinking faculty.

So în mintea mea is literally in my mind.

This is different from cap, which means head in the physical sense:

• capul meu = my head
• mintea mea = my mind

In this sentence, mintea mea is the natural choice because the sentence is about an idea staying in someone’s thoughts.

Yes, if the context already makes it clear what is remaining.

Romanian often allows the subject to be omitted when it is understood. So:

• Rămâne în mintea mea.

can work if everyone already knows what it is.

But if you want the sentence to stand on its own clearly, keeping Ideea is better:

• Ideea rămâne în mintea mea.