Nominal reduplication

Level 2

In Indonesian, repeating a noun (e.g., buku-buku) is the primary way to express plurality or variety. However, unlike English, it is not always mandatory to mark the plural if the context is already clear.

How It Works

Indonesian is a 'number-neutral' language, meaning a base noun like buku can mean 'a book' or 'books' depending on the context. Reduplication is used when you want to be explicit.

1. Plurality and Variety
Simple reduplication (repeating the whole word) primarily indicates plurality. However, when combined with affixes, it often emphasizes 'various kinds of' or 'collectivity'. For example, buku-buku means 'books', while buah-buahan (with the suffix -an) suggests 'various kinds of fruits'.

2. When NOT to Reduplicate
A cardinal number already supplies quantity: dua buku is the basic standard model. Quantifiers such as banyak commonly make ordinary plural repetition unnecessary. Semua means all and can occur with an explicitly identified plural set. Repetition that is lexical, such as kupu-kupu, remains part of the word; the rule is not to remove all repeated forms after every quantifier.

3. Morphological Types

Full Reduplication (Dwilingga): Repeating the entire word (e.g., meja-meja).
Partial Reduplication (Dwipurwa): Repeating the first syllable with a schwa sound (e.g., laki becomes lelaki, tangga is historically related to tetangga). These established words have lexical meanings: lelaki can mean one man and tetangga one neighbor, so partial repetition does not automatically mean plural.
Affixed Reduplication: Reduplication with a suffix like -an to show variety or collections (e.g., daun-daunan for 'various types of leaves' or dedaunan for 'foliage').
Imitative Reduplication: Involves sound changes (e.g., sayur-mayur for 'all sorts of vegetables').

4. Pseudo-reduplication
Some words only exist in a doubled form and do not indicate plurality. For example, kupu-kupu (butterfly) and kura-kura (turtle) are always doubled, even if there is only one.

Examples (5)

Anak-anak sedang bermain di taman.
The children are playing in the park.
Word by Word: Child-child [progressive] play at park.
Here, 'anak-anak' explicitly indicates that there is more than one child.
Saya membeli buah-buahan di pasar.
I bought various fruits at the market.
Word by Word: I buy fruit-fruit at market.
The reduplication of 'buah' (fruit) with the suffix '-an' emphasizes the variety of different fruits purchased.
Ada banyak orang di pesta itu.
There are many people at that party.
Word by Word: There-is many person at party that.
Notice that 'orang' is not reduplicated because the word 'banyak' (many) already indicates plurality.
Ibu mencuci piring-piring kotor.
Mother is washing the dirty dishes.
Word by Word: Mother wash plate-plate dirty.
Reduplication is used here to show that there are multiple plates being washed.
Kupu-kupu itu sangat indah.
That butterfly is very beautiful.
Word by Word: Butterfly that very beautiful.
'Kupu-kupu' is a pseudo-reduplicated word; it is always doubled even when referring to a single butterfly.

Common Mistakes

Using reduplication after a number or quantifier.
Saya punya dua buku-buku.
Saya punya dua buku.
For the ordinary meaning two books, standard Indonesian uses dua buku without marking the plural again. Lexical repetition is different: dua kupu-kupu still needs the full word for butterfly.
Omitting the hyphen in an explicitly repeated noun.
Saya makan apel apel setiap hari.
Saya makan apel-apel setiap hari.
Write repeated apel-apel with a hyphen. The sentence can deliberately refer to multiple apples; for a simple habitual statement, Saya makan apel setiap hari is also sufficient. Neither plurality nor a daily habit automatically requires repetition.

How It Connects

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Nominal reduplicationLevel 2

Learn This First

To understand nominal reduplication, you first need to understand how Indonesian handles plurality in its simplest form—which is usually through context or specific quantity words rather than changing the noun itself. Reduplication is a specific strategy used to emphasize variety or when the context doesn't otherwise make plurality clear.