La definición era tan clara que hasta mi amiga encontró otro sinónimo enseguida.

Era is the imperfect form of ser, and here it describes a background quality: the definition was clear.

• era = it was / used to be, giving description or context
• fue = it was, but more like a completed event or a summary fact
• estaba = it was, but usually for a state or condition, often temporary

In this sentence, La definición era tan clara... means the sentence is setting the scene by describing how clear the definition was. That is why era sounds natural.

Tan ... que means so ... that.

So:

• tan clara = so clear
• que hasta mi amiga encontró... = that even my friend found...

The full structure is very common in Spanish:

• tan + adjective + que
• tan + adverb + que
• tanto/a/os/as + noun + que

Examples:

• Es tan fácil que cualquiera puede hacerlo. = It is so easy that anyone can do it.
• Habla tan rápido que no entiendo nada. = He speaks so fast that I understand nothing.

Because clara agrees with la definición, which is a feminine singular noun.

In Spanish, adjectives usually agree with the noun they describe:

• el libro claro
• la definición clara

Since definición is feminine, the adjective must also be feminine:

• clara

Yes, hasta often means until, but here it means even.

In this sentence:

• hasta mi amiga = even my friend

This use adds emphasis, often suggesting surprise:

• the definition was so clear that even my friend found another synonym right away

So hasta can mean:

• until: Hasta mañana = Until tomorrow
• even: Hasta Juan lo entendió = Even Juan understood it

Context tells you which meaning is intended.

In normal modern Spanish, possessives like mi, tu, su, nuestro, etc. usually go directly before the noun, without an article.

So you say:

• mi amiga
• tu casa
• su coche

Not:

• la mi amiga ❌

That old-fashioned structure exists in some historical or literary language, but not in standard modern Spanish.

Encontró is the preterite, which is used for a completed action.

Here, the idea is that your friend found another synonym as a specific finished event.

• encontró = found
• encontraba = was finding / used to find

So the sentence contrasts:

• era for background description
• encontró for the main completed action

This is a very common combination in Spanish:

• imperfect for the situation or description
• preterite for the event that happened within that situation

Because otro normally does not take un before it.

So you say:

• otro sinónimo = another synonym
• otra idea = another idea

Not:

• un otro sinónimo ❌

This is different from English, where another historically contains an + other, but in Spanish otro already does that job by itself.

Enseguida means right away, immediately, or straight away.

In this sentence:

• encontró otro sinónimo enseguida = found another synonym right away

It is a very common adverb in Spanish.

In Spain, enseguida usually strongly suggests something happened very quickly, though in some contexts native speakers may use it a little more loosely, depending on tone and situation.

Yes. Hasta mi amiga is a fixed, natural way to say even my friend.

Placing hasta directly before the word it emphasizes is common:

• Hasta mi amiga lo entendió. = Even my friend understood it.
• Hasta yo lo sé. = Even I know it.

If you move things around, the emphasis can change or the sentence may sound less natural.

So hasta mi amiga is the most straightforward way to highlight my friend as the surprising part.

Because Spanish often leaves subject pronouns out when the verb ending already shows who is doing the action.

• encontró already tells us it is he/she/it found
• the noun mi amiga is explicitly there, so ella is unnecessary

Spanish avoids pronouns more often than English does:

• Mi amiga encontró... not usually
• Mi amiga ella encontró... ❌

The accent marks show which syllable is stressed.

• definición → stress on the last syllable
• encontró → stress on the last syllable
• sinónimo → stress on the second syllable: nó

These accents are important because they follow Spanish stress rules and sometimes distinguish forms clearly.

For example:

• encontro would be stressed differently and is not the correct form here
• encontró is specifically the preterite he/she found

Yes, but the meaning and feel are slightly different.

• enseguida = right away / immediately
• rápidamente = quickly

So:

• encontró otro sinónimo enseguida stresses how soon it happened
• encontró otro sinónimo rápidamente stresses the speed of the action

Both can work, but enseguida sounds especially natural here because the sentence is emphasizing how easy and obvious the definition was.

Yes, it is very normal Spanish word order.

The structure is:

• La definición = subject
• era tan clara = was so clear
• que = that
• hasta mi amiga = even my friend
• encontró otro sinónimo = found another synonym
• enseguida = right away

Spanish word order is often flexible, but this version sounds natural and clear. It builds emphasis nicely:

1. describe the definition
2. show the result
3. add surprise with hasta mi amiga
4. finish with enseguida for extra emphasis on how quickly it happened