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English

Once

Spanish

Once

False Friend

Etymology

English once comes from Old English anes, the genitive of an (one), while Spanish once is inherited from Latin undecim, meaning eleven (unus + decem).

Relevant meaning (EN)

Once refers to a single occasion, a former time in the past, or the moment that a specific condition is met.

Relevant meaning (ES)

Once refers to the number eleven (11), the integer following ten and preceding twelve, or the eleventh day of a month. In some Spanish-speaking regions, it can also refer to a light afternoon snack or tea.

Note: We show the meaning most relevant to this word pair; words can have other meanings depending on context.

Related Cognates

Moment / MomentoChocolate / ChocolateEnergy / Energía

What is a cognate?

English and Spanish share thousands of words because both languages have deep roots in Latin. Over centuries, English borrowed many Latin‑based words, while Spanish evolved directly from Latin. That’s why so many Spanish words look familiar to English speakers, and vice versa.

“If you speak English, you already know thousands of Spanish words.”

What are the three major types of cognates?

Animal → Animal

Perfect cognate

Identical spelling, identical meaning—but pronunciation varies. These are freebie words you don't have to memorize.

Communication → Comunicación

Near cognate

Small, predictable spelling shift. Swap -tion for -ción and you've unlocked hundreds of words.

Embarrassed → Embarazada

False friend

Looks familiar but means something different. Embarazada means pregnant, not embarrassed.

Why do English and Spanish share so many words?

Both languages inherited thousands of words from Latin — English through the Norman Conquest and centuries of scholarly borrowing, Spanish as a direct descendant of Vulgar Latin. The result is an enormous pool of shared vocabulary that makes Spanish one of the most accessible languages for English speakers.

10,000+

cognate pairs shared between English and Spanish — that’s thousands of words you already recognize.

30%

of English words have a Spanish cognate, giving you a head start before you even open a textbook.

Spelling patterns that unlock hundreds of words

Most cognates follow predictable rules. Learn a handful of patterns and you can decode words you’ve never studied.

EnglishSpanishExample
-tion-ciónNation → Nación
-ity-idadUniversity → Universidad
-ous-osoFamous → Famoso
-ble-blePossible → Posible
-al-alAnimal → Animal
-ment-mentoMoment → Momento
-ence-enciaSilence → Silencio

Watch out for false friends

Not every familiar-looking word means what you think. These are called false friends — or falsos amigos — and they can lead to awkward mix-ups if you’re not careful.

Our collections flags false friends so you can learn the difference before it catches you off guard.

Embarazada

Looks like: EmbarrassedMeans: Pregnant

Éxito

Looks like: ExitMeans: Success

Actual

Looks like: ActualMeans: Current

Frequently asked questions

What is the difference between a cognate and a loan word?

A cognate shares a common ancestor in two languages — both words evolved naturally from the same root. A loan word is borrowed directly from one language into another. For example, "animal" is a cognate (both come from Latin), while "kindergarten" is a loan word borrowed into English from German.

Can cognates help me learn Spanish faster?

Absolutely. Research shows cognates can help you pick up more vocabulary faster. Because you already know the shape and meaning, you can focus your energy on pronunciation, grammar, and the words that don't have English equivalents.

Are cognates always spelled the same?

No. Perfect cognates have identical spelling (like "animal"), but most have small, predictable differences that follow consistent patterns — English -tion becomes Spanish -ción, -ity becomes -idad, and so on. Once you learn a few patterns, you can decode thousands of words.

How many Spanish words can I already understand?

Estimates range from 10,000 to 15,000 cognate pairs. Even a beginner can recognize several thousand Spanish words on sight, providing a significant head start in reading comprehension and vocabulary building.

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