ξέρω vs γνωρίζω | Greek Grammar

Both ξέρω and γνωρίζω can mean “know.” Ξέρω is the everyday default for facts, answers, people, languages, and learned skills. Γνωρίζω also means know or be acquainted; it is common with people and becomes especially frequent in careful, professional, and formal information language. Its perfective form γνώρισα normally shifts to the event “met / got to know.”

The choice is therefore not a rigid ban by register. First decide whether you mean a state of knowing or the event where acquaintance or knowledge began. Then choose the register and frame.

Quick decision map

Meaning	Safest choice	Important alternative
know a fact or answer in everyday speech	ξέρω	γνωρίζω in careful/formal wording
know a person / be acquainted	ξέρω or γνωρίζω	γνωρίζω is not restricted to formal language here
know how to perform a learned skill	ξέρω να + verb	compare ability with μπορώ on its owner page
knew / was acquainted over a past stretch	ήξερα or γνώριζα	state viewpoint
met / got to know	γνώρισα	bounded beginning of acquaintance
found out a fact	έμαθα	ξέρω has no aorist

Δεν ξέρω αν το ταχυδρομείο είναι ανοιχτό σήμερα.

dhen kséro an to tachidhromío íne anichtó símera.

I don't know whether the post office is open today. (everyday)

Δεν γνωρίζω αν το αίτημα έχει εγκριθεί ακόμη.

dhen ghnorízo an to étima échi engrithí akómi.

I do not know whether the request has been approved yet. (formal/professional)

The second is not “more correct”; it simply belongs more readily to institutional or careful wording. Among friends, δεν ξέρω would normally sound less stiff.

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For ordinary conversation, start with ξέρω. Move to γνωρίζω when acquaintance with a person is salient or the context calls for careful/formal “know, be aware.” Do not turn that preference into an absolute rule.

Knowing people: a genuine overlap

With a person as accusative object, both verbs can describe an existing acquaintance.

Ξέρεις τον αδερφό μου από το γυμναστήριο;

kséris ton adherfó mu apó to yimnastírio;

Do you know my brother from the gym? (everyday)

Γνωρίζεις προσωπικά τη νέα διευθύντρια;

ghnorízis prosopiká ti néa dhiefthíndria;

Do you know the new director personally?

Γνωρίζω with people is neutral and current; it need not sound bureaucratic. Ξέρω is generally more conversational and can suggest familiar knowledge depending on context, but the overlap is broad. The sentence—not a dictionary label—determines how close the relationship is.

Τον ξέρω χρόνια, αλλά δεν είμαστε στενοί φίλοι.

ton kséro chrónia, alá dhen ímaste stení fíli.

I've known him for years, but we're not close friends.

Γνωριζόμαστε από μια παλιά συνεργασία, όχι κοινωνικά.

ghnorizómaste apó mia paliá sinerghasía, óchi kinoniká.

We know each other from an old collaboration, not socially.

The reciprocal γνωριζόμαστε is standard. Informal plural ξερόμαστε also exists, but the verb cards own those paradigms: ξέρω and γνωρίζω.

Knowledge and skills

For a fact, answer, language, or learned procedure, ξέρω is the productive everyday verb. Ξέρω να + verb means “know how to” as an acquired skill.

Ξέρω να αλλάζω λάστιχο, αλλά δεν έχω τα κατάλληλα εργαλεία.

kséro na alázo lásticho, alá dhen écho ta katálila erghalía.

I know how to change a tire, but I don't have the right tools.

Η Δανάη ξέρει πολύ καλά ιταλικά και λίγα γερμανικά.

i Dhanái kséri polí kalá italiká ke lígha yermaniká.

Danai knows Italian very well and a little German.

Γνωρίζω can also occur with a field or language, especially in CVs, assessments, and careful prose. It presents possession of knowledge rather than the everyday skill frame; it is not ungrammatical.

Η υποψήφια γνωρίζει άριστα γαλλικά και χειρίζεται το πρόγραμμα με ευχέρεια.

i ipopsífia ghnorízi árista ghaliká ke chirízete to próghrama me efchéria.

The candidate has an excellent command of French and uses the software proficiently. (formal/professional)

English can can hide a separate choice between learned skill and present ability. That contrast belongs to ξέρω να vs μπορώ να.

Γνώριζα versus γνώρισα

The imperfect γνώριζα describes an existing state of acquaintance or knowledge. The aorist γνώρισα presents the boundary where that relationship began: “met” or “got to know.” This is a lexicalized aspect contrast, not a claim that all knowing has a clean beginning.

Γνώριζα ήδη τον Στέλιο όταν άρχισε να δουλεύει μαζί μας.

ghnóriza ídhi ton Stélio ótan árchise na dhulévi mazí mas.

I already knew Stelios when he started working with us. (state)

Γνώρισα τον Στέλιο την πρώτη μέρα στο εργαστήριο.

ghnórisa ton Stélio tin próti méra sto erghastírio.

I met Stelios on the first day at the laboratory. (beginning of acquaintance)

Χάρηκα που σας γνώρισα και ελπίζω να συνεργαστούμε ξανά.

chárika pu sas ghnórisa ke elpízo na sinerghastúme ksaná.

It was a pleasure meeting you, and I hope we work together again.

The present γνωρίζω does not mean “meet” by itself in these examples; it describes knowing. The perfective forms γνώρισα / να γνωρίσω commonly focus on coming into acquaintance. The γνωρίζω reference card also covers formal “inform” and “experience” extensions.

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Past-time test: if the relationship already existed, choose ήξερα / γνώριζα. If the sentence locates its beginning, choose γνώρισα. English uses separate verbs “knew” and “met”; Greek lets aspect help draw the boundary.

Ήξερα, έμαθα, and the missing aorist

Ξέρω has no aorist or perfective stem. Ήξερα means “I knew” as a state. For the bounded event “I found out / learned,” Greek normally switches lexeme to έμαθα.

Ήξερα τη διεύθυνση, αλλά δεν θυμόμουν τον αριθμό.

íksera ti dhiéfthinsi, alá dhen thimómun ton arithmó.

I knew the address, but I couldn't remember the number.

Έμαθα τη νέα διεύθυνση μόλις μου έστειλαν το μήνυμα.

ématha ti néa dhiéfthinsi mólis mu éstilan to mínima.

I found out the new address as soon as they sent me the message.

Do not use γνώρισα as a universal replacement for the missing aorist of ξέρω. With a person it commonly means “met”; with information, έμαθα is usually the ordinary “found out.”

Common Mistakes

Manufacturing an aorist from ξέρω

❌ Χθες ξέρησα ποιος πήρε τελικά τη θέση.

Incorrect — ξέρω has no aorist; ‘found out’ is έμαθα.

✅ Χθες έμαθα ποιος πήρε τελικά τη θέση.

chthes ématha pios píre teliká ti thési.

Yesterday I found out who ultimately got the position.

Translating every γνώρισα as “knew”

The aorist commonly marks the meeting; the imperfect marks an existing relationship.

Τη γνώριζα πριν μετακομίσει στην Αθήνα.

ti ghnóriza prin metakomísi stin Athína.

I knew her before she moved to Athens.

Τη γνώρισα αφού μετακόμισε στην Αθήνα.

ti ghnórisa afú metakómise stin Athína.

I met her after she moved to Athens.

Treating γνωρίζω as exclusively formal

It is entirely ordinary for acquaintance with a person.

Γνωρίζεις τη Μαρίνα που μένει στον πάνω όροφο;

ghnorízis ti Marína pu méni ston páno órofo;

Do you know Marina, who lives on the floor above?

Omitting με after reciprocal γνωρίστηκα

❌ Γνωρίστηκα τον νέο συνάδελφο στο σεμινάριο.

Incorrect — reciprocal γνωρίστηκα takes με before the other person.

✅ Γνωρίστηκα με τον νέο συνάδελφο στο σεμινάριο.

ghnorístika me ton néo sinádhelfo sto seminário.

I met the new colleague at the seminar.

Key Takeaways

ξέρω is the conversational default for facts, answers, people, languages, and ξέρω να skills.
γνωρίζω also genuinely means “know / be acquainted”; it is neutral with people and common in formal information language.
γνώριζα presents an existing state; γνώρισα commonly means “met / got to know.”
ξέρω has no aorist: use έμαθα for “found out,” not an invented form or automatic γνώρισα.
Register guides the overlap, but does not create a rigid ξέρω-everyday / γνωρίζω-formal ban.

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