what is it?
An indefinite noun compound (belirtisiz isim tamlaması) joins two nouns so that the first noun acts as a classifier or category label and the second noun — the head — carries the third-person singular possessive suffix -(s)I. The result names a type or category of thing rather than a specific item belonging to a specific owner. For example, otobüs bileti means «a bus ticket» (a kind of ticket), not «the ticket of a particular bus». The first noun receives no suffix; only the head is marked.
when to use it
Naming a type or category. Use the indefinite compound when the first noun describes what kind of thing the head is: Türkçe dersi (a Turkish lesson), şehir merkezi (a/the city centre). No specific possessor is implied.
Contrast with the definite compound. When a specific, identifiable possessor is meant, Turkish uses the definite compound: the first noun takes the genitive -(n)In and the head still takes -(s)I. Compare: şehir merkezi (city centre, a type of place) vs. şehrin merkezi (the centre of the city — that specific city).
Fixed or lexicalised expressions. Many everyday compound nouns in Turkish are indefinite compounds: el çantası (handbag), otobüs bileti (bus ticket). They function as single vocabulary items.
formation
The structure is: NOUN₁ (bare) + NOUN₂ + -(s)I. The suffix -(s)I follows vowel harmony and has two shapes:
-I (four-way: -ı / -i / -u / -ü) after a consonant-final head.
-sI after a vowel-final head — the -s- is a buffer consonant.
| head noun | ends in | compound form | meaning |
|---|---|---|---|
| bilet | consonant | otobüs bilet-i | bus ticket |
| merkez | consonant | şehir merkez-i | city centre |
| ders | consonant | Türkçe ders-i | Turkish lesson |
| çanta | vowel | el çanta-sı | handbag |
When the compound takes a case suffix, an additional -n- buffer is inserted between the -(s)I marker and the case ending. This is the same buffer used with all third-person possessive suffixes.
| compound | case | form | meaning |
|---|---|---|---|
| şehir merkezi | dative (-e) | şehir merkez-i-n-e | to the city centre |
| şehir merkezi | accusative (-i) | şehir merkez-i-n-i | the city centre (object) |
| otobüs bileti | accusative (-i) | otobüs bilet-i-n-i | the bus ticket (object) |
| el çantası | dative (-e) | el çanta-sı-n-a | to the handbag |
examples in context
common pitfalls
Adding genitive to the first noun when no specific possessor is meant. «otobüsün bileti» means «the ticket of that specific bus» — a definite compound. For a general bus ticket, keep the first noun bare: «otobüs bileti». Genitive on the first noun always signals a definite, specific possessor.
Dropping the -(s)I marker on the head. «*şehir merkez» is not a valid compound. The head must always carry -(s)I: «şehir merkezi».
Forgetting the -s- buffer after a vowel-final head. «*el çantaı» is incorrect. When the head ends in a vowel, insert -s- before the suffix: «el çantası».
Adding case directly to the head without the -n- buffer. «*şehir merkeze» is wrong. The -(s)I suffix behaves like a third-person possessive, so case endings require the -n- buffer: «şehir merkezine» (merkez-i-n-e).
Three sentences, graded here. Nothing is saved and no account is needed.
Bu filmin ___ İngilizce. (altyazı)
Fill in the blank with the correct compound form of the word in parentheses.