Esperanto grammar Part of Chapter 18

CEFR B2-C1

4 min read

Test yourself (20 questions)

Poetic Esperanto: Elision, Stress and What Verse Can Bend

By Michael McGettrickUpdated 12 October 2026

Rule 16 of the Fundamento allows two elisions: a noun may drop its final -o, and the article may drop its -a. An apostrophe marks the gap. The rule covers nothing else, and the stress never moves.

the apostrophe (a dropped vowel)object -nplural -jWhat do the colours mean?
Full formIn verseAllowed?
yes: a singular noun
yes: the article
no changeno: the -n marks the object
no changeno: the -j marks the plural
no changeno: an adjective
no changeno: a

Quick check

Now use it: three quick questions on the chart above. The full practice is further down.

Spot the mistake

0/3

Each line has one elision Rule 16 does not allow. Tap it.

You meet these apostrophes in the anthem and the old songs. The song lessons lean on this page.

Rule 16: two elisions

The Fundamento's own English version of the rule:

The a of the article, and final o of substantives, may be sometimes dropped euphoniae gratia ... in such cases an apostrophe should be substituted for the discarded vowel.

Euphoniae gratia means for the sake of sound. In practice that means , where a is counting syllables:

NounElidedEnglish
world
heart
humanity
road

It is always optional. is not worse Esperanto than ; it is one syllable longer. And it costs nothing: by the time you hear in a line, you already know it is a noun.

What Rule 16 does not cover

The rule takes a FINAL vowel, and only on a noun or . Every other ending carries grammar:

FormWhy it stays whole
the last letter is -n, the object
the last letter is -j, the plural
both at once
, an adjective's -a is not a noun's -o
, a ending carries the tense
an adverb ending

So can never be the object ( has it after a preposition: ). To say I see the world, you need the whole word:

  • . - I see the world.

ends in -o but is a correlative, not a noun, so ti' is not standard. PMEG notes that poets occasionally use such forms anyway; in your own writing, leave whole.

l' leans back

the apostrophe (a dropped vowel)What do the colours mean?

is read with the word before it, so it follows a preposition ending in a vowel, such as , , or . sounds like del:

  • - Under the sacred sign of hope ( )
  • - Until humanity's beautiful dream ( )
  • - The waves of the sea threatened us ( o)

The third line matters: begins with a consonant, and the elision is still right, because the vowel needs is the one in . is Zamenhof's; o is Antoni Grabowski's. Poets occasionally use with no preposition before it, but after a vowel is the normal place.

dank' al: the elision in everyday speech

One elision left poetry. (thanks to) is , a thanks, with its -o dropped:

  • , . - Thanks to you, I found the way.
  • , . - the same, with the adverb ending.

Both are common. Anywhere else, an apostrophe in prose looks like .

The stress stays put

the stressed syllablethe apostrophe (a dropped vowel)What do the colours mean?

Esperanto stress falls on the second-last syllable. When a word is elided, the stressed vowel stays where it was, so the elided word ends on it:

FullStressElidedStress
es-PER

That is the s reason for eliding. Without it, every word of two or more syllables ends on a weak beat. With it, a line can land hard on its last syllable, as Grabowski's do:

, ',

, !

' (the brotherhood) ends the first line on a stress; ends the second on a weak beat. How the two endings alternate, how to count syllables, and why rhyming on an ending alone ( with ) is called adasismo: rhyme and metre.

Mistakes English speakers make

WrongRightWhy
. .an -o under an -n cannot go
bel' an adjective keeps its -a
as ko-ROthe stress stays on the same vowel

What to do next

  1. Read La Espero and find its four apostrophes.
  2. Sing Ho, mia kor' and mark every elided word.
  3. Then read rhyme and metre for counting the lines.

See also

  • Rhyme and metre - counting syllables, strong line endings and adasismo.
  • La Espero - Zamenhof's anthem, with and .
  • La Tagiĝo - Grabowski's song, with ', and .
  • Ho, mia kor' - an elision in the title of one of the first Esperanto poems.
  • The accusative - the -n that elision never touches.
  • The article la - the word whose -a Rule 16 lets you drop.

Practise: test yourself

Sort into groups

0/8

Can Rule 16 put an apostrophe in place of the last vowel?

Tap a word, then the group it belongs in.

Spot the mistake

0/3

Each line has one elision Rule 16 does not allow. Tap it.

Pick the right one

0/4

Where does the stress fall? Capitals mark the stressed syllable.

  1. kor' (from koro)

  2. homar' (from homaro)

  3. esper' (from espero)

  4. mondo

Matching

0/5

Match each form to what Rule 16 says about it.

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Frequently asked questions

What does the apostrophe mean in Esperanto poetry?
It marks a dropped vowel. Rule 16 of the lets a noun lose its final -o ( becomes , becomes ) and the article lose its -a ( ). Esperanto has no possessive apostrophe and no contracted negatives. Elision is always optional, which is why it lives in poetry and song, where a is counting syllables.
Can you elide the -o of or ?
No. Elision drops a final vowel, and in and the -o is followed by an -n or a -j that carries grammar. So only a singular noun with no -n can lose its -o: can become , but , and stay whole. Adjectives () and verbs () keep their endings too.
How is pronounced in Esperanto?
Together with the word before it: is read as del , and as del . That is why turns up after prepositions ending in a vowel, such as , , , , and pro. The word after may begin with a consonant, as in Grabowski's .
Does elision move the stress in Esperanto?
No. The stressed vowel stays where it was, so the elided word now ends on it: is and is ; is and is . Since an unelided word of two or more syllables always ends unstressed, elision is the usual way a ends a line on a strong beat.
Is correct Esperanto?
Yes. (thanks to) is the one elision you will meet all the time in everyday prose and speech: , a thanks, with its -o dropped, frozen into a fixed phrase. , with the adverb ending, says the same and is also common. Outside that phrase, elision belongs to .