Harmony Across Stacked Suffixes

You learned vowel harmony on single suffixes: the plural of ev is evler, the plural of okul is okullar, each ending chosen by the stem's last vowel. But Turkish words are rarely just stem-plus-one-suffix. Real words stack four, five, six endings in a row — evlerimizdekiler, gözlüklerinden — and that raises a question the single-suffix rule does not answer: when there are five suffixes, does each one look back at the root, or at its immediate neighbour? The answer is the key to reading long Turkish words, and it is the single most important refinement of harmony you will make at this level. Harmony is local and sequential: each suffix harmonizes to the vowel right before it, and the effect cascades down the chain.

The rule: each suffix copies its left neighbour

In a chain of suffixes, harmony is computed one link at a time, left to right. The first suffix harmonizes to the stem. The second suffix harmonizes to the first suffix, not to the stem. The third harmonizes to the second, and so on. Each suffix only ever "sees" the vowel immediately to its left; it never reaches back over an intervening suffix to consult the root.

For most words this distinction is invisible, because the root and every suffix happen to be on the same side (all front, or all back), so "copy the root" and "copy the neighbour" give the same answer. The distinction only becomes visible — and important — when a vowel somewhere in the chain switches sides. Then everything downstream follows the new vowel, not the root.

A worked five-suffix word: evlerimizdekiler

Take evlerimizdekiler "the ones at our houses." Five suffixes ride on the stem ev. Watch harmony pass from each vowel to the next:

Read down the "harmonizes to" column: every step looks only at the piece directly above it. The plural -ler takes its e from ev; the possessive -imiz takes its i's from -ler; the locative -de takes its e from -imiz; and so on. No suffix jumps back to the stem.

Because ev is front and unrounded, and nothing in this chain switches sides, every harmonizing vowel comes out front — which is why "copy the root" would have given the same spelling here. To see the difference, we need a chain whose vowel does flip.

When the chain flips: a back-vowel cascade

Now take okullarımızdakiler "the ones at our schools," built on the back-vowel stem okul:

Here okul ends in back, rounded u, so the cascade runs down the back side: okul-lar-ımız-da-ki-ler. Compare it line for line with evlerimizdekiler and you see the same five slots producing mirror-image vowels — -lar not -ler, -ımız not -imiz, -da not -de — purely because the cascade started on the back side. Each suffix still only consulted its left neighbour; it is just that the neighbour was back-vowelled all the way down.

The real payoff of the "left neighbour" rule shows up when a suffix in the middle of the word introduces a vowel on the opposite side from the root. The clearest everyday case is the rounding introduced by the first-person plural and certain other suffixes. Consider gördüklerimizden "from the ones we saw":

• gör- — front, rounded ö
• -dük — the participle -DIk harmonizes to gör → front + rounded → ü: gör-dük
• -ler — plural -lAr harmonizes to -dük → front → -ler
• -imiz — -(I)mIz harmonizes to -ler → front, unrounded → -imiz (rounding has dropped away, because -ler is unrounded)
• -den — ablative -DAn harmonizes to -imiz → front → -den

Notice the rounding (ö → ü) lives only at the top of the chain and then dies out the moment an unrounded suffix vowel (-ler) appears — and every suffix after that stays unrounded, because each copies its unrounded neighbour. A learner who tried to harmonize everything to the rounded root gör- would wrongly round the later vowels. The local rule predicts the real form; the "copy-the-root" shortcut does not.

Why disharmonic loanwords still behave

Here is where the local rule earns its keep. Turkish has many loanwords whose vowels do not harmonize internally — kitap (Arabic), otobüs (French), televizyon. Their root vowels are on different sides, so there is no single "frontness of the root" to copy. The local rule sidesteps the problem entirely: suffixes harmonize to the last root vowel only, and from there to each other. The internal disharmony of the loan never propagates outward, because suffixes only ever look at the vowel immediately to their left — which is the last root vowel, then each suffix in turn.

In otobüs the vowels are o-o-ü — disharmonic — but the suffix chain runs entirely off the last vowel ü (front, rounded): otobüs-ler-imiz-de-ki-ler, all front. In kitap the vowels are i-a; the chain runs off the last vowel a (back): kitap-lar-ımız-dan, all back. The disharmonic root is irrelevant downstream; only its final vowel seeds the cascade.

The one suffix that breaks the chain: -ki

Every cascade has a single famous exception, and you already met it in evlerimizdekiler: the relational suffix -ki ("the one at/in/of"). It is invariant — it stays -ki no matter what precedes it, on front and back stems alike: masadaki "the one on the table," bahçedeki "the one in the garden," yarınki "tomorrow's." It refuses to harmonize.

(There is a tiny set of exceptions where -ki does round to -kü after a few words like bugün → bugünkü and dün → dünkü, shown above — but it never goes to the back side; you will never see -kı.)

The crucial point for stacked suffixes is what happens after -ki. Because -ki is front in shape, any suffix that follows it harmonizes as if the chain were front — that is exactly why evlerimizdekiler ends in front -ler and not back -lar. So -ki does not just sit there inertly; it resets the cascade to the front side for everything downstream. On a back-vowel word this is visible:

Sokak is back (a-a), so sokak-ta is back. But -ki is front, so the plural and accusative after it come out front: sokak-ta-ki-ler-i, not -lar-ı. The chain was running back, -ki flipped it to front, and the local rule carried that flip onward. This is the purest demonstration that harmony reads the left neighbour, not the root: nothing about the root sokak explains the front -leri; only the -ki right before it does. (More on -ki and its separate-word cousin in the -ki suffix vs separate word.)

Common mistakes

The root gör- is rounded, but rounding dies at the first unrounded suffix vowel (-ler). Everything after -ler is unrounded: -imiz-den, never -imüz-den. Copy the neighbour, not the root.

Kitap's last vowel is back a, and the whole chain stays back: -lar-ımız-dan. The front -den would only appear if a neighbour were front — and none is.

The relational -ki is invariant. After back masada it is still -ki, never -kı — and it then flips any following suffix to the front side.

Because -ki is front, the suffixes after it harmonize front: -ki-ler-i, not -ki-lar-ı. Read the neighbour to the left — it is -ki (front), so go front.

Key takeaways

• Harmony in a long word is local and sequential: each suffix harmonizes to the vowel immediately before it, never reaching back to the root.
• Compute a stacked word left to right, one link at a time: stem → suffix₁ → suffix₂ → … — evlerimizdekiler = ev-ler-imiz-de-ki-ler.
• A vowel that switches sides mid-chain (e.g. rounding dying at -ler) redirects everything downstream; "copy the root" would predict the wrong form.
• Disharmonic loanwords harmonize fine because suffixes only see the last root vowel, then each other: kitaplarımızdan, otobüslerimizde.
• The relational -ki is invariant (never -kı) and resets the cascade to the front side for any suffix that follows it: sokaktakileri.