A complete roadmap of the language

The Data Center

Interactive frequency dictionaries that provide full visibility of the most important content in your target language and give you the tools to commit them to muscle memory.

A top-down view of the frequency distribution of words in your target language.
Find and fill gaps in your vocabulary.
Commit the most important language patterns to muscle memory through high-volume repetition practice.

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Vocabulary coverage

Know what to learn next.

Vocabulary coverage

Know what to learn next.

A BIRD’S-EYE VIEW OF THE LANGUAGE

See what matters, what you’ve mastered, and what to practice next.

When learning a language, one of the hardest questions is ‘what do I need to study next?’

Beginners have nearly unlimited choice of where to start. But because a small number of words account for the majority of usage, they should prioritize the most common vocabulary. Advanced students often lack a clear picture of what they’ve mastered, where their gaps are, and what to study next.

The Data Center shows you which words are used most often, lets you track mastery, and helps you choose what to study next. Charts show how much of the dictionary you’ve mastered, while integrated sentence practice helps you internalize each word’s forms and usage patterns until you can use them instinctively in conversation.

The Data Center is a complete roadmap to the language.

It gives you a top down view of the most important vocabulary, lets you choose what words to study, track what you have learned, and gives you the tools to commit them to muscle memory.

Three ways into the data

Explore the language through several complementary dictionaries.

Each view organizes the same underlying language data around a different study need, while keeping definitions, examples, practice, and progress connected.

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Top Words

A list of approximately 35,000 of the most frequently used words in the language.

A Top Lemmas dictionary connecting word forms to a shared base form

Top Lemmas (Root Words)

This dictionary lists the most frequently used root words by adding up all instances of their various forms. Helps you to learn the various inflection patterns of the language and vocabulary simultaneously.

A Verb dictionary with a running figure on its cover

Top Verbs

The top several thousand verbs in the language, along with conjugation tables. Naturally internalize the conjugation patterns of the language by practicing the various forms in context.

Understand each word

Review clear definitions before you practice.

Open a word to compare its meanings, part of speech, frequency, and example usage. Everything you need to understand the entry stays together in one view.

By default, the definitions are shown in the target language to maintain an immersive environment but you can toggle the translation button to see them in your own language.

Top 2,500 Verbs

Return to word list

Definitions Inflections

essere

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IPA: ˈɛsːere

Categoria grammaticale: verbo

Infinito Presente: essere

Infinito Passato: essere stato

Participio Presente: essente

Participio Passato: stato

Gerundio Presente: essendo

Gerundio Passato: essendo stato

Definitions

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1. Definizione: Indica l’esistenza, la presenza o la realtà di qualcuno o qualcosa.

Definition: It indicates the existence, presence, or reality of someone or something.

Frase esemplare: Esiste una soluzione a ogni problema.

Example sentence: There is a solution to every problem.

Sinonimi: esistere, trovarsi, sussistere

Contrari: non essere, mancare

2. Definizione: Indica la condizione, la qualità o lo stato di una persona o cosa.

Definition: It indicates the condition, quality, or state of a person or thing.

Frase esemplare: Mario è felice oggi.

Example sentence: Mario is happy today.

Sinonimi: apparire, sembrare

Contrari: non essere

3. Definizione: Viene usato come copula per collegare il soggetto con una qualità, professione, nazionalità o identità.

Definition: It is used as a copula to connect the subject with a quality, profession, nationality or identity.

Frase esemplare: Anna è insegnante.

Example sentence: Anna is a teacher.

4. Definizione: Usato come ausiliare nei tempi composti di molti verbi.

Definition: Used as an auxiliary in the compound tenses of many verbs.

Frase esemplare: Sono andato al mercato.

Example sentence: I went to the market.

5. Definizione: Serve a indicare appartenenza a una categoria o gruppo.

Definition: It is used to indicate membership in a category or group.

Frase esemplare: La balena è un mammifero.

Example sentence: The whale is a mammal.

Sinonimi: rientrare

Inflection tables

See all of the different forms of a word in one place.

The Lemma and Verb Dictionaries provide comprehensive inflection tables for each entry, allowing you to see all the different forms of a word at a glance.

Top 2,500 Verbs

Return to word list

Definitions Inflections

ser

Total study reps completed: 824

Filter inflected forms

Inflection

StudyReps

Presente

	Singular	Plural
1ª persona	soy	somos
2ª persona (informal)	eres	sois
3ª persona/usted	es	-
3ª persona/ustedes	son	-

Begin study

Pretérito Perfecto Compuesto

Pretérito Imperfecto

	Singular	Plural
1ª persona	era	éramos
2ª persona (informal)	eras	erais
3ª persona/usted	era	-
3ª persona/ustedes	eran	-

Begin study

Pretérito Pluscuamperfecto

Pretérito Perfecto Simple

Pretérito Anterior

	Singular	Plural
1ª persona	hube sido	hubimos sido
2ª persona (informal)	hubiste sido	hubisteis sido
3ª persona/usted	hubo sido	-
3ª persona/ustedes	hubieron sido	-

Begin study

Futuro Simple

Futuro Perfecto

Condicional Simple

Condicional Compuesto

Presente de Subjuntivo

Perfecto de Subjuntivo

Imperfecto de Subjuntivo

Pluscuamperfecto de Subjuntivo

Imperativo

Imperativo Negativo

Practice in context

Add these words to muscle memory.

Knowing a word doesn't mean simply remembering it's definition.

Rather, it means having to instinctual command to recall it spontaneously in conversation, use the correct form, and effortlessly select the appropriate words that go with it.

The frequency dictionaries come with an integrated study interface that lets you do high-volume, in-context repetition drills to reinforce your learning and build automaticity.

Top 2,500 Verbs

Return to word list

Definitions Inflections

ser

Total study reps completed: 824

Filter inflected forms

Inflection

StudyReps

Presente

	Singular	Plural
1ª persona	soy	somos
2ª persona (informal)	eres	sois
3ª persona/usted	es	-
3ª persona/ustedes	son	-

Begin study

Pretérito Perfecto Compuesto

Pretérito Imperfecto

INFLECTION REPETITION PRACTICE

SENTENCE MODE

INFLECTION REPS: 84

SENTENCE REPS: 0

Current inflection

1ª persona · Singular

2ª persona (informal) · Singular

1ª persona · Plural

1ª persona · Singular

2ª persona (informal) · Singular

1ª persona · Plural

soy

I am

eres

you are

somos

we are

Soy estudiante de español.

I am a Spanish student.

Eres una persona muy amable.

You are a very kind person.

Somos parte del mismo equipo.

We are part of the same team.

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See progress in context

Watch your vocabulary coverage grow.

As you mark words as mastered, you will see your vocabulary coverage increase on the chart, giving you a visual indicator of how many of the most important words you have mastered and where to focus your efforts.

A clearer path through the language

The Data Center is like a roadmap to the language, giving your a top-down view of the vocabulary landscape and the most efficient path to fluency.

Prioritize high-impact vocabulary

Learning the most commonly used words first is the efficient path to fluency. Our frequency dictionaries show you exactly which words you need to learn to .

You decide what to study

The Data Center puts you in control, letting you focus on exactly what you need to study. This makes it perfect both for beginners starting out and advanced learners looking to fill specific gaps.

Muscle memory building drills

Don't just simply memorize definitions. Develop an instinctual command of vocabulary through high-volume, in-context repetition based practice with sentences calibrated to your current level.

Keep track of your progress

Record the words you master as you learn and see your growing vocabulary coverage reflected in the stats charts for each dictionary.

Increase your vocabulary coverage effectively and efficiently.

Use our interactive frequency dictionaries to see exactly what you need to study next, keep track of your progress, and develop the instinctual command of vocabulary necessary for fluent conversation.

Create your free account

The Data Center

See what matters, what you’ve mastered, and what to practice next.

Explore the language through several complementary dictionaries.

Top Words

Top Lemmas (Root Words)

Top Verbs

Select the word you want to study.

Review clear definitions before you practice.

essere

Definitions

See all of the different forms of a word in one place.

ser

Add these words to muscle memory.

ser

Watch your vocabulary coverage grow.

FREQUENCY DISTRIBUTION

The Data Center is like a roadmap to the language, giving your a top-down view of the vocabulary landscape and the most efficient path to fluency.

Prioritize high-impact vocabulary

You decide what to study

Muscle memory building drills

Keep track of your progress

Increase your vocabulary coverage effectively and efficiently.