Declension of 'jeden'

01

Gender Agreement in the Singular

In the singular nominative case (the subject of the sentence), jeden has three basic forms corresponding to the three grammatical genders:

• Masculine: jeden
• Feminine: jedna
• Neuter: jedno

• Jeden stół jest wolny.

  One table is free.

• Ta firma to jedna wielka rodzina.

  This company is one big family.

• To jest tylko jedno pytanie.

  This is just one question.

02

The Accusative Distinction (Masculine)

When jeden is used in the accusative case (usually as the direct object of a verb), the masculine form changes based on "animacy"—whether the noun is a living creature or an inanimate object.

Masculine Inanimate

For objects and abstract concepts, the form remains jeden (identical to the nominative).

• Kupię jeden bilet.

  I will buy one ticket.

• Mam jeden problem.

  I have one problem.

Masculine Animate

For people and animals, the form changes to jednego (identical to the genitive).

• Znam jednego lekarza.

  I know one doctor.

• Widzę jednego ptaka.

  I see one bird.

Note that feminine (jedną) and neuter (jedno) have their own distinct accusative forms that do not depend on animacy.

• Mam jedną siostrę.

  I have one sister.

03

Using 'Jeden' in the Plural

Although "one" is inherently singular, jeden has plural forms: jedni (masculine personal) and jedne (all other genders). These are used in two specific situations.

1. Pluralia Tantum (Nouns with no singular)

Some nouns only exist in the plural form, such as drzwi (door/doors), spodnie (trousers), or okulary (glasses). To say "one" of these items, you must use the plural form jedne.

• W pokoju są tylko jedne drzwi.

  There is only one door in the room.

• Zgubiłem jedne okulary.

  I lost one pair of glasses.

2. Meaning "Some"

When used in the plural, jeden often acts as an indefinite pronoun meaning "some" or "certain people/things". It is frequently paired with drudzy (others) or inni (others) to create a contrast.

• Jedni to lubią, drudzy nienawidzą.

  Some like it, others hate it.

• Jedne jabłka są słodkie, a inne kwaśne.

  Some apples are sweet, and others are sour.

04

Declension Overview

Because jeden declines like an adjective, its endings change through the cases. Here are the most common patterns to recognize:

Genitive (of one)

Used for possession, negation, and after specific prepositions.

• Masculine/Neuter: jednego
• Feminine: jednej

• Nie mam ani jednego grosza.

  I don't have a single penny.

• Szukam jednej książki.

  I am looking for one book.

Instrumental (with one)

Used to express "with" or the means by which something is done.

• Masculine/Neuter: jednym
• Feminine: jedną

• Jeżdżę jednym samochodem od lat.

  I have been driving one car for years.

• Rozmawiałem z jedną kobietą.

  I spoke with one woman.

Locative (about/on one)

Used after prepositions like o (about), w (in), or na (on).

• Masculine/Neuter: jednym
• Feminine: jednej

• Myślę o jednym filmie.

  I am thinking about one movie.

• Mieszkamy w jednym domu.

  We live in one house.

05

Idiomatic Usage: 'Wszystko jedno'

A very common phrase involving this word is wszystko jedno. Literally translating to "all one", it corresponds to the English "it's all the same" or "it doesn't matter".

• Jest mi wszystko jedno.

  It makes no difference to me.