Spaces and hyphens do real analytical work in Esperanto. A space normally separates grammatical words; productive affixes and the roots of an ordinary compound normally form one written word. A hyphen can expose a boundary for clarity, but it usually does not create a new kind of compound or change its meaning.
English is inconsistent about writing compounds open, hyphenated, or closed: coffee table, well-known, and notebook. Esperanto starts from a more productive rule: build an Esperanto word as one word, then use a hyphen only where a recognized clarity or notation convention calls for one.
One grammatical word, one written unit
An ordinary derived word is written together. Prefixes such as mal-, re-, ek-, eks- and suffixes such as -et-, -eg-, -ej-, -ist- attach to their base. Roots in an ordinary compound also join into one orthographic word.
Mi revidos vin morgaŭ ĉe la fervoja stacidomo.
I will see you again tomorrow at the railway station.
In revidos, re- attaches to vid-. In stacidomo, the roots staci- and dom- form one compound. Spaces would incorrectly present those elements as independent words.
Ni matenmanĝis en malgranda kafejo.
We had breakfast in a small café.
The words matenmanĝis, malgranda, and kafejo each contain multiple meaningful parts, but morphology does not force spaces between those parts.
La eksministro nun laboras kiel instruisto.
The former minister now works as a teacher.
Eksministro is one derived noun. Writing eks ministro would wrongly detach the productive element eks- as if it were a normal independent word.
A word boundary can change the analysis
Compare a compound with an adjective plus noun:
Mi vundis mian dikfingron.
I injured my thumb.
La skulptaĵo havas unu dikan fingron.
The sculpture has one thick finger.
Dikfingro is a conventional compound naming a body part; dika fingro freely describes any finger as thick. The boundary signals whether the first element helps build a lexical unit or remains a separate adjective.
The same distinction appears between matenmanĝo, “breakfast,” and matena manĝo, “a morning meal.” Their meanings overlap, but the first names a conventional meal as one compound, while the second is an adjective–noun phrase and can describe any meal held in the morning.
La hotelo ofertas matenmanĝon, sed nia matena manĝo komenciĝis tro malfrue.
The hotel offers breakfast, but our morning meal started too late.
This is why spacing is connected to meaning even though each individual letter keeps its regular sound.
Function words stay separate
Articles, prepositions, conjunctions, pronouns, and most particles are independent words: la domo, en la urbo, kun ŝi, ĉar li venis. English sometimes fuses function words with neighbors through contractions; Esperanto normally preserves the word boundary.
Ŝi venis kun sia frato, ĉar ili loĝas en la sama urbo.
She came with her brother because they live in the same city.
Do not attach la to a following noun or ne to a verb. The negative particle has scope as its own word.
Mi ne komprenis la demandon.
I did not understand the question.
The poetic elisions l’ and noun-final apostrophe follow special rules and belong on apostrophe and elision; they are (literary/poetic), not everyday models for collapsing word boundaries.
What an optional hyphen does
Within an ordinary compound, a hyphen may be inserted (clarifying/editorial) to make the component boundary easier to see. PMEG gives the principle that this does not change the word’s meaning: kafotablo and kafo-tablo both mean “coffee table.” Closed spelling is generally the normal choice; a hyphen is useful when a long, unfamiliar, or visually confusing compound would otherwise slow the reader.
La kafotablo staras apud la fenestro.
The coffee table stands by the window.
En la lernolibro la aŭtoro skribis ‘kafo-tablo’ por montri la du partojn.
In the textbook, the author wrote kafo-tablo to show the two parts.
The hyphen does not make kafo-tablo two words. It remains one compound. Overusing hyphens in every transparent derivation makes prose visually heavy and does not match normal continuous spelling.
Names and internal capitals
Hyphens are common when a compound contains a visibly capitalized name or when parts of a geographical name need to remain recognizable: Nov-Jorko, Sud-Afriko, ne-Esperanta. Closed alternatives occur for many names and formations, and official choices can be lexical rather than mechanically predictable.
Post la konferenco ŝi flugos de Nov-Jorko al Sud-Afriko.
After the conference, she will fly from New York to South Africa.
La unua alineo estas Esperanta, sed la dua estas ne-Esperanta.
The first paragraph is in Esperanto, but the second is not in Esperanto.
The hyphen in ne-Esperanta avoids the visually awkward sequence of a lowercase element followed immediately by an uppercase E. If the derivative is lowercase, neesperanta can be written closed. Follow established spellings for particular names rather than freely inserting hyphens inside an Esperanto root.
Numbers, abbreviations, and labels
Some hyphens belong to specialized written conventions:
- 23-a “23rd” and 15-ono “one fifteenth” may join digits to an Esperanto ending; unhyphenated 23a is also used.
- d-ro “doctor” and s-ro “mister” mark omitted internal letters (abbreviation).
- E-klubo can use E- as an informal abbreviation of Esperanto-.
These conventions do not license hyphens wherever ordinary number words require spaces. Basic tens and hundreds join (dudek, tricent), while following units and mil remain separate in standard multiword numerals (dudek tri, du mil).
La 23-a kunveno komenciĝos je la naŭa.
The 23rd meeting will begin at nine.
Venis du mil dudek tri partoprenantoj.
Two thousand twenty-three participants came.
Writing du-mil-dudek-tri would use hyphens where the grammatical number expression requires word boundaries.
Hyphens in fallback input
Unicode is the normal spelling for ĉ, ĝ, ĥ, ĵ, ŝ, ŭ. In the Fundamental h-system, a hyphen may be needed to prevent an actual consonant-plus-h boundary from being misread as a substitute diacritic sequence. A form such as (h-system fallback) ses-hora keeps s+h visibly separate rather than suggesting sh = ŝ. This is an encoding problem, not a reason to write the ordinary Unicode form ses-hora routinely; normal publication can simply use seshora.
The x-system is mechanically clearer because x is not an Esperanto alphabet letter: sx can unambiguously encode ŝ. Raw h-system and x-system forms should remain explicitly labeled (input fallback) and converted to Unicode whenever possible.
La seshora vojaĝo finiĝis antaŭ noktomezo.
The six-hour journey ended before midnight.
A short editing exchange
— Ĉu mi skribu ĉi tion kun streketo? — Nur se la streketo vere helpas la leganton.
— Should I write this with a hyphen? — Only if the hyphen truly helps the reader.
That advice applies to optional clarity hyphens, not to fixed lexical spellings or specialized notation, which should be checked individually.
Common Mistakes
1. Separating a productive affix from its base. Prefixes and suffixes form one word with the base.
❌ Mi re vidos la eks ministron morgaŭ.
Incorrect — re- and eks- have been detached as though they were independent words.
✅ Mi revidos la eksministron morgaŭ.
I will see the former minister again tomorrow.
2. Using a hyphen where a space is required in a number. Hyphens do not replace grammatical word boundaries.
❌ La grupo havas dudek-tri membrojn.
Incorrect — the unit after dudek is a separate number word.
✅ La grupo havas dudek tri membrojn.
The group has twenty-three members.
3. Copying an English open compound. Esperanto commonly forms one compound word.
❌ Ni renkontiĝos ĉe la urbo centro.
Incorrect — copying the open English compound city center.
✅ Ni renkontiĝos ĉe la urbocentro.
We will meet in the city center.
4. Assuming every optional hyphen changes meaning. A clarity hyphen can leave the analysis and meaning unchanged.
❌ Mi pensas, ke kafotablo kaj kafo-tablo devas nomi malsamajn meblojn.
Incorrect — assuming kafotablo and kafo-tablo must name different pieces of furniture.
✅ Kafotablo kaj kafo-tablo povas esti du skriboj de la sama kunmetaĵo.
Kafotablo and kafo-tablo can be two spellings of the same compound.
5. Leaving an input workaround in finished prose. Encoding punctuation should not displace ordinary Unicode spelling.
❌ Mi publikigis la provizoran h-sisteman formon ‘shipo’.
Incorrect as finished prose — I published the temporary h-system form shipo.
✅ Mi publikigis la Unikodan formon ‘ŝipo’.
I published the Unicode form ŝipo.
Key Takeaways
Write productive derivations and normal compounds as one word; keep independent grammatical words separated. Use a hyphen for a recognized notation or when it materially clarifies an internal boundary, not as a generic substitute for a space. Preserve established name spellings and number structure, and treat h-system hyphens as fallback-encoding tools rather than default Unicode orthography.
Related Topics
- Apostrophe and ElisionA2 — How Esperanto marks the limited omission of final vowels in nouns, the article, and a few established expressions.
- Abbreviations and InitialsA1 — How Esperanto shortens common expressions, titles, names, and organizations without losing clarity or correct spelling.
- Capitalization in Titles and NamesA2 — Capitalize Esperanto titles and multiword names clearly without importing English title case or erasing accepted editorial variation.
- Roots and Grammatical EndingsA2 — See how Esperanto combines meaningful roots with noun, adjective, adverb, and verb endings to create usable words.
- Compound Head OrderA2 — Interpret and build ordinary Esperanto compounds with the general head on the right and its modifier before it.
- Building Large NumbersA1 — Build and use thousands, millions, and larger Esperanto numbers with correct spacing, noun behavior, scale values, and case marking.