Rellené el formulario de devolución.

Rellené is the first-person singular preterite form of rellenar, so it means I filled in / I filled out.

• rellenar = to fill in, fill out, fill up
• rellené = I filled out

In this sentence, it refers to completing a form by writing the required information.

The accent mark shows the correct stress: re-ye-NE.

It also helps distinguish this form from rellene, which could be:

• the present subjunctive form
• or a formal command form

So rellené clearly means I filled out in the past.

It is the preterite tense, which in Spanish is often used for a completed action in the past.

So Rellené el formulario de devolución means that the action of filling out the form is seen as finished.

A learner might compare:

• Rellené = I filled out / I did fill out
• Rellenaba = I was filling out / I used to fill out

Here, the preterite fits because it describes one completed event.

Spanish often omits subject pronouns when they are not needed, because the verb ending already tells you who the subject is.

• rellené already means I filled out
• so yo is optional

You could say Yo rellené el formulario de devolución, but it usually adds emphasis, contrast, or clarity.

El formulario means the form, especially in the sense of an official document to complete.

For example:

• un formulario de inscripción = a registration form
• un formulario online = an online form

A native English speaker may think of forma, but forma usually means shape or manner/form in a more abstract sense, not normally a document you fill out.

So for paperwork, formulario is the natural choice.

De devolución means for a return or related to returning something.

So:

• formulario de devolución = return form

In many contexts, devolución can refer to:

• returning a product
• giving something back
• sometimes a refund/return process, depending on context

In this sentence, it most naturally means a form used when returning an item.

Spanish often uses de + noun to describe the type or purpose of something.

So formulario de devolución works like:

• return form
• literally, form of return

This is very common in Spanish:

• tarjeta de crédito = credit card
• centro de salud = health centre
• billete de avión = plane ticket

You might hear para una devolución in some situations, but formulario de devolución is the standard, natural phrasing for the name of the document.

Yes, often you can, but there are small differences in tone and usage.

• rellené = filled in / filled out
• llené = filled
• completé = completed

For forms:

• rellenar un formulario is very common in Spain
• completar un formulario is also correct
• llenar un formulario is understood, but in Spain rellenar often sounds more natural for forms

So in Spain, Rellené el formulario is an excellent, idiomatic choice.

El means the, so el formulario means the form.

This suggests the speaker is referring to a specific form, probably one already known from the context:

• the return form for a purchase
• the form the company asked them to complete
• the form on the website

If it were un formulario de devolución, it would mean a return form, without identifying a specific one.

Yes, the word order is very straightforward here:

• Rellené = verb
• el formulario de devolución = direct object

So the structure is:

• Verb + object

This is very natural in Spanish and corresponds closely to English:

• I filled out the return form

Spanish is often flexible with word order, but this is the most neutral and common arrangement here.

In standard Spain pronunciation, it is approximately:

• re-ye-NE

A rough guide:

• rr in rellené is a strong rolled or trilled r
• ll in most of Spain sounds like the y in yes
• the final é is stressed

So the stress falls on the last syllable:

• re-ye-NE

The whole sentence is roughly:

• re-ye-NE el for-mu-LA-rio de de-bo-lu-THYON in much of Spain, where c before i/e sounds like th in think

But pronunciation varies by region, and many speakers will say devolución with an s sound instead.

It can mean more than just returning a product.

Depending on context, devolución can refer to:

• returning an item to a shop
• giving something back
• a refund or repayment
• the act of handing something back

In formulario de devolución, the most likely meaning is a form for returning a purchased item. Context will tell you whether the focus is on the item being returned, the refund process, or both.